If you have the money, there really is no better case for cooling than these two. The power supplies are rather anemic, but im pretty sure they can be upgraded.
Zalman TNN300AF Noise Free Multimedia Micro Tower Case w/350W Fanless PSU - FrozenCPU.com Zalman TNN500AF Noise Free Mid Tower Case (w/ 400W Fanless PSU) - FrozenCPU.com
the entire tower is a massive heatsink, stellar reviews for overclocking and cooling as well.
