If anyone can find a case that can fit a 480/360 dual rad and a crossfire 7990. I would prefer both the PSU and the 480 rad on the bottom and the 360 on the top.
Only thing I can think of off hand would be the Mountain Mods Extended Ascension http://www.mountainmods.com/CYO_picker.php?casnu=Extended_Ascension - you'll need to configure it to your liking - I might suggest the rear panel quad option. They will do custom panels also.
Just an option, a little pricy but an option
Wont the 900D do that? maybe the 750 d will as well but probably gonna have to mod it a bit. but im sure the 900d supports a 360 in the top and front with a 480 + 240 in the basement.
I would like to do as little as little modding as possible but will do if it does not requiring soldering. I have looked into the 900D before and I will look into the mountain mods