For a powerful and heat-crazy PC I built a few years ago, I went with Antec's Super LANBoy case. Lots of fan mount points (I did upgrade some of the case fans that it came with) including front, back and side. It has a nice clear door and a heat-disapating aluminum chassis. Price wasn't too bad and the looks are decent. And it's got slide-in drive mounts and most everything inside is easy to get to (no bloody hands and grunts every time you crack open the case to upgrade a component). It has front-facing USB ports as well as audio.
-------------------- Lisa Gade Editor in Chief, MobileTechReview