I saw Linus's video yesterday on the Corsair 900D case (
http://www.corsair.com/900d) and thought it would be a pretty epic case to put several GPUs in. The end result if one invested the money to watercool it would be nothing short of amazing.
Yes, the case is a bit expensive for a mining rig, and anyone wanting to have multiple GPUs would probably just use risers and a separate frame anyway, but it's still a decent thought.
Aircooling the GPUs shouldn't be too much of an issue with the number of intake + exhaust fans.
Thoughts?