Well are you comfortable filling the CPU/MB rez where you have it in the picture?
Otherwise, if you have to put it lower, which would conflict with the videocard, find a way to mount it above your floor-rad, or directly to the drive cage.
Hm, that would probably put a lot of weight on the drive cage considering you chopped its poor feet off.
May I suggest a combination of these:
http://www.performance-pcs.com/catal...ducts_id=25294
http://www.performance-pcs.com/catal...ducts_id=25296
Let me know if you don't fully get my idea, but you would have the pump on fan. You would also probably have to support the rez better though.