Case: check out Cooler Master Centurian. I have one and am very pleased with it.
Video card: look at eVga 7800 GT CO (model 517). It has a copper heatsink and is factory overclocked. Also, lifetime warranty. Runs about $319.
PSU - Everyone says Enermax. If even thinking about going to SLI in the future, get at least a 550 W PSU.
It's a good setup with lots of upgrade potential as time goes on. Heck, a year from now, you could drop in and FX-60 and basically get a whole new computer.