Yeah, I agree, it is really hard to pick out a case. I used to look at the fans a case offered (front, back, and perhaps side), but these days most cases are very similar. 120mm fans are minimum. With cases, looks play a big role in your decisionmaking, I think.
As far as PSUs go, if you have a quad system with SLI, you will need a pretty hefty PSU. Don't try to cut on costs here -- cheap PSU's will advertise high power, but don't mention that it is often only peak wattage, not high *sustained* wattage, which is really needed . High output on +5V and +12V lines is recommended, as these voltage lines will be tested severely by your hardware. Good brands with focus on power and silence are e.g. Seasonic, Corsair, Zalman, Tagan.
I would visit
SilentPCReview and take a look there. They have a good idea of what it takes to build a silent pc.
Jam it back in, in the dark.
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