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I'm trying so hard not to make a "best case scenario" joke......oops!
The main things are good ventilation area and fans, assuming the case is otherwise large enough to house everything you want. There are quite a few cases out there, and often the ones made with high end gaming in mind tend to offer the best designs. You have already picked a good one that also looks cool (no pun intended), which may not be of functional importance, but a sweet looking machine reinforces the message that it is not your normal machine. A couple of other nice cases are the Corsair Graphite Series and the Thermaltake Chaser. There are others as well, but those were the first ones to come to mind.