It depends on what you are doing with it. Air/water cooling? Multiple GPUs? How big does it need to be? CM makes a bunch of good cases under $100 (USD?), that NZXT is a beaut and I'm sure it would work great if that's what your heat is set on.
Thanks man. Currently I have a pretty measly single GPU setup and a E7400 Core 2 Duo. However, I am planning to upgrade soon within the next 3-6 months so want a good case for the same. Tired of my crappy case now. Will be using air cooling and a single GPU setup preferably, might want to leave some room for SLIing though. CM cases are high-end and good stuff but something good at a lower range would be cooler.