It seemed like the ilevel area around 820 and only two relics is about 140-150k average for me. As soon as I got my third relic I jumped up to about 180 and Ive been steadily climbing as I get higher ilvl. 844 ilvl right now and I do about 200-220k dps in Heroic groups and about 10kish more in Mythic. The build up is not near as bad as people that dont play the class would lead you to believe. No where near as long as Warlocks build up currently is. Once you start rolling in a dungeon and stick to a golden rule of 5 maximum SW P's out, and only 2 VT's out, you'll cleave enough to get where people "think" you need to be. Continue to build your haste, it is the number one most essential stat Ive found that increases my damage.
Your big cleave classes like Demon Hunter's do face roll shit in there, but the higher ilvl you get with the proper stats - the less that gap is. With everything enchanted, at base im at just over 8000 haste. In combat I jump up to about 58% haste by the time void ends and the lingering buff keeps me there afterwards until I reenter void form.