on the outside of the supply area of fleet all the vendors are named level X Modifications or Level X gear. once you have a set of orange gear you never need to buy new gear except for looks. it's only the mods you want. On the inside ring there are all the previous end game gear from the various vendors with various types of currency (elite, ultimates, etc), the rare drop turn in gear, etc. from the various raids the game has had at the various level caps that the game has had.
the current end game raid stuff is like, 198? or 196? something like that? and now with Ziost Joe casual just leveling solo doing storymode ends up with 190 gear, which if you wanna do raiding is a better start point than the previous iterations. all the 178 and 186 gear from previous era's raiding is basically obsolete you don't need to do that to get geared to start the raid scene, if that's your thing. Personally the combat is pretty meh and the engine is starting to get rather dated, but the best part of this game was always the storymode anyway. I just treat it as a bioware RPG that you can talk to and group with other players in if you choose.