CORSAIR Professional Series HX650 (CMPSU-650HX) 650W ATX12V v2.2 / EPS12V 2.91 SLI Ready 80 PLUS BRONZE Certified Modular Active PFC Power Supply (This is probably overkill but i haven't been able to find any good suggestions on selecting a PSU) http://www.newegg.com/Product/Product.aspx?Item=N82E168...
If you haven't bought yet, then I basically agree with Kelthic.
CASE: ANTEC ONE
This case supports front USB3, has two fans, and a cable hiding system.
*FYI, I recommend you get a motherboard with USB3 FRONT CONNECTORS and a case that supports USB3 Front. Eventually thumb drives are going to get really fast. USB3 supports up to 600MB/second. USB2 supports 60MB/second. Once they use SSD technology we'll see USB3 thumb drives over 500MBytes/second (less than two years).
NCIX might be your best option. You need to add up all the parts/tax/shipping. Look around for sales. I've seen the HD6870 for $150. The HD7000 series isn't necessarily a very good value.
Don't forget about Windows, make sure it's 64-bit:
Windows 7 Premium 64-bit OEM