I just unlocked my mainframe for the first time, up to tier 2, and it cost 1,600 marks. This is going to take a lot of farming, it's best to start now.
Here is a list of the temporary powers from the Home Turf DLC. I left right before they were added. There's no way you'll be competitive for T5 without them.
Active Cell (Must have active cell to choose Dispenser items. Level 1 requires one cell, Level 2 requires 2 cells, etc. They can be replaced once they drop below 50%)
Level 1 - Lithium Cell: Replace Cell = $1000
Level 2 - Ionic Cell: Replace Cell - $1750
Level 3 - Hydrogen Cell: Replace Cell - $2500
Level 4 - Antimatter Cell: Replace Cell - $3250
Orbital Strike
Level 1 - Calls down an Orbital Strike to Damage enemies in an Area
Level 2 - Calls down an Orbital Strike to Damage enemies and cause Damage Over Time in an Area
Level 3 - Calls down an Orbital Strike to Ground, Root, Damage enemies, and cause Damage Over Time in an Area
Level 4 - Calls down an Orbital Strike to Reduce Control Resistance, Remove Shielding, Ground, Root, Damage enemies, and cause Damage Over Time in an Area
Supply Drop
Level 1 - Heals Allies who pass through it
Level 2 - Heals Allies who pass through it and Heals Over Time
Level 3 - Restores Power, Heals Allies who pass through it, and Heals Over Time
Level 4 - Increases Damage Output, Restores Power, Heals Allies who pass through it, and Heals Over Time
Sidekick/Accomplice (Sidekick uses a weapon of your choice, Bow, One Handed, Shield, etc)
Level 1 - Untrained Sidekick Attacks your enemies
Level 2 - Sidekick Attacks your enemies and Heals you
Level 3 - Sidekick Taunts, Attacks your enemies, and Heals you
Level 4 - Sidekick Taunts, Attacks your enemies, Replenishes your power, and Heals you
Backup/Henchmen (Backups are based on your unlocked Base Themes
Level 1 - Two Backups attack your enemies
Level 2 - Two Backups attack your enemies
Level 3 - Three Backups attack your enemies
Level 4 - Three Flying Backups attack your enemies
Weapon Mods
Blaster Adapter
Level 1 - [Chance every 120s] 20 - 28 Dmg, Knockout - Ray (2s), 1 enemy
Level 2 - [Chance every 90s] 20 - 28 Dmg, Knockout - Area (2s), up to 2 enemies
Level 3 - [Chance every 75s] 20 - 36 Dmg, Knockout - Area (2s), up to 3 enemies
Level 4 - [Chance every 60s] 20 - 36 Dmg, Knockout - Area (2s), up to 6 enemies
Restorative Adapter
Level 1 - [Chance every 120s] Chance to heal self (w/weapon atack)
Level 2 - [Chance every 90s] Chance to heal self (w/weapon attack)
Level 3 - [Chance every 75s] Chance to heal self and one member(w/weapon atack)
Level 4 - [Chance every 60s] Chance to heal self and three member(w/weapon atack)
Replenishing Adapter
Level 1 - [Chance every 120s] 140 - 160 Power to self; power restore w/weapon attack
Level 2 - [Chance every 90s] 226 - 286 Power to Self; power restore w/weapon attack
Level 3 - [Chance every 75s] 226 - 286 Power to Self; power restore w/weapon attack
Level 4 - [Chance every 60s] 226 - 286 Power to Self; power restore w/weapon attack
Absorption Adapter
Level 1 - [Chance every 120s] Reduced dmg by 50% up to 350 (w/weapon atack)
Level 2 - [Chance every 90s] Reduced dmg by 50% up to 500 (w/weapon atack)
Level 3 - [Chance every 75s] Reduced dmg by 66% up to 900 (w/weapon atack)
Level 4 - [Chance every 60s] Reduced dmg by 75% up to 1400 (w/weapon atack)
Neck
Escalating Might
Level 2 - Increase Might by 22 for 8s after hitting enemy with a harmful super power (stacks up to 3 times)
Level 3 - Increase Might by 39 for 8s after hitting enemy with a harmful super power (stacks up to 3 times)
Level 4 - Increase Might by 87 for 8s after hitting enemy with a harmful super power (stacks up to 3 times)
Escalating Replenishing Procs
Level 2 - Crit Power Chance increases by 1% for 6s when Defib, PE, Recharge is used (stacks)
Level 3 - Crit Power Chance increases by 2% for 6s when Defib, PE, Recharge is used (stacks)
Level 4 - Crit Power Chance increases by 3% for 6s when Defib, PE, Recharge is used (stacks)
Fortified Blocking
Level 2 - adds 5600 Def/Tough; prevent up to 77% of incoming dmg
Level 3 - adds 6200 Def/Tough; prevent up to 78% of incoming dmg
Level 4 - adds 7400 Def/Tough; prevent up to 80% of incoming dmg
Focused Restoration
Level 2 - Increases healing by 70 until hit, applies every 10s
Level 3 - Increases healing by 99 until hit, applies every 10s
Level 4 - Increases healing by 192 until hit, applies every 10s
Relentless Precision
Level 2 - Precision increases by 39 when Hit counter is 9+ for 6s
Level 3 - Precision increases by 99 when Hit counter is 9+ for 6s
Level 4 - Precision increases by 170 when Hit counter is 9+ for 6s
Back
Berserker
Level 3 - dmg increases by 30% when health drops below 35%
Breakout Protection
Level 3 - 700 Def/Tough 4s after using Breakout
Breakout Regeneration
Level 3 - Regenerate Health 4s after using Breakout
Violent Breakout
Level 3 - Breakout knocks enemies down and away (every 30s)
Weakening Field
Level 3 - Enemy Control Resistance reduced by 30% for 8s when being struck by an enemy
Feet
Dashing Combos (Super Speed)
Level 3 - After Vortex Trap, Tornado Pull, Cyclone Push, Whirling Dervish, or Phase Dodge, tap Melee to perform a Dash Attack
Inertial Inversion (Super Speed)
Level 3 - Recover 6% of total power/3s after Inertial Flywheel(every 15s)
Empowered Glide (Acrobatics)
Level 3 - Recover 2% of total pwr/s when using RAG
Tumbling Master (Acrobatics)
Level 3 - Dodge Roll is no longer vulnerable to Interrupt; tap movement to cancel out into Acrobatic combo
Exhilirating Dive Bomb (Flight)
Level 3 - Recover 6% of total power/3s after Divebomb (every 15s)
Swooping Combos (Flight)
Level 3 - After Air Burst, Downdraft, High Pressure, Low Pressure, Swoop or Whirlwind, tap melee top perform a Swoop Attack
Deadly Block
Level 3 - Blocking counter causes dmg = 25% of Precision
Explosive Block
Level 3 - Block counter knocks further and increases helplessness 1s
Chest
Core Strength
Level 4 - 10 Dmg in Troll/Dmg Role; no penalty in Tank/Healer Role
Enhanced Recovery
Level 4 - Blue Baubles = 200 pwr
Extended Super Charge
Level 4 - Supercharge increase by 350 pts; effects requiring full charge will need min 1000 pts
Penetrating Strikes
Level 4 - attacks ignore 528 Def/774 Tough
Quick Healing
Level 4 - 10% to healing received
Hands
Empowered Channeling
Level 4 - For Sandblast, Ionic Drain, Absorb Heat, Flame Cascade, Snuff Out, Photon Blast, Artic Gust, Glacier Flash, Avalanche, Impaling Ice, Freezing Breath, Heat Vision, Sonic Shout, Chain Saw, Minigun, Light Blast, Triage, Impaling Thorns, Roar, Final Ruin, Soulstorm:
not vulnerable to Interrupt, prevents standard control effects, adds 3500 Def/2000 Tough
Enduring Damage (Dmg Role)
Level 4 - For Fireburst, Mass Det, Frost Blast, Mass Lev, Telekinetic Bolt, Bloom, Invoc of Renewal:
60% dmg Bonus for 20s (unless overwritten)
Improved Stealth
Level 4 - For Stealth, Invis, Sneak:
Stealth Power prevents dmg/control effects and increases movement speed for 2.5s
Mighty Smashing
Level 4 - Smashing Weaponized object adds Weap Rating = 25% of might, also adds 5% Crit Hit
Regenerative Shielding
Level 4 - For Gemstone Shield, Flux, Energy Shield, Reflection, Light Barrier, Telekinetic Shield, Swarm Shield, Boon of Souls, Hard Light Shield:
Heal Self
Reserve Tank
Level 4 - Increase Max Power by 845