I have a HAF932 case, so space is no problem. My cpu is cooled by a corsair H100 in push/pull

The H80 i mount on the back outlet .. i considerd to replace my (big) psu from the bottom to the outside of the case, to get a free air-intake for the other GTX580 wich is closest to the PSU right now, but i am making something els for that .. directed airflow from the bottom of thr case should do the trick.