Just a little input, feel free to ignore me as other people are already giving advice and I don't want to tread on anyone's toes.
Personally I would avoid the GTX 295 as it doesn't make sense at current pricing, instead I'd buy an ATI HD5870 which gives around the same performance whilst using less power and having DX11 capabilities. Due to it not being a multi-GPU card, frame rates are also more stable.
I'd advise at least a quality 650W PSU for a GTX 295 if you do go that route though, a Corsair 650TX or HX (HX is the modular version, for easier cable management) would be more than adequate whilst a 750 or 850TX/HX would give even more headroom for further upgrades. I highly recommend Corsair power supplies, excellent quality and support.
As for a case, it depends what you're looking for other than having room for large cards. If you like to show off your machine, an Antec 902 would be a good choice, as it has a side panel and blue LED fans as standard, with decent cable management options. The Antec 1200 is a bigger version, only really useful if you want more drive bays.
The Coolermaster CM690 is a popular alternative to the 902. At the higher end of the case market, Lian Li, Corsair and Silverstone have excellent cases, some of which are flashy and some of which are very subdued.
It depends very much on what you want from your case and your overall budget.
Again, I hope I'm not butting in or treading on anyone's toes here, but hopefully there are some valid points in there which you may consider