I have these cases to choose from:
Zalman Z3 Plus
Cooler Master N400
BitFenix Shinobi Core
and Corsair 200R
I am currently swaying towards the Zalman the R1 , because it seems to have most space inside and the R1 looks pretty nice also. But from the reviews it seems that the N400 might provide better cooling solutions.
I might switch to watercooling at some point. And the AMD 280x seems pretty crammed inside my old case right now.