" I think your best bet would be to get it for the PC, honestly. There will be mods which can even lengthen the life of multiplayer. Not only that, It'll look better and play better. Much better than the PS3 controller is for shooters, anyway. "
Don't count on mods for the PC version.
The game doesn't come with a version of UnrealED and the inclusion of GFWL will just put further obstacles in peoples way.
The kinds of mods you're likely to see will be few and far between.
Also the lack of dedicated server will prevent any multiplayer mods being played.