the case I use is very good to keep the top mount psu cooled as it has an open vent manufactured for water, but the psu sucks in the cool air from the top expelling at r3ear.
also the bottom mount id build the same in my case
I would use bottom mount, but was running three way sli on rampage II board and the PCI-Ex slots were shifted down for this board by one slot each to make room for the sound card that comes with rampage II which used a PCI-Ex x1 slot on the top. an ideal case for this board I found would have been a ten slot case by lian Li or Tt Xaser VI, but I ended up changing the board plus with the top air vent I have no probs