New build for a friend, $900

So I'm putting together a build for a friend, the budget is around $900 with the OS.
Here is what I have so far:
PCPartPicker part list: http://pcpartpicker.com/p/hCJ9
Price breakdown by merchant: http://pcpartpicker.com/p/hCJ9/by_merchant/
Benchmarks: http://pcpartpicker.com/p/hCJ9/benchmarks/

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($215.98 @ NCIX US)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard ($134.99 @ Amazon)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($39.99 @ Newegg)
Storage: Western Digital Caviar Black 1TB 3.5" 7200RPM Internal Hard Drive ($98.03 @ Amazon)
Video Card: MSI GeForce GTX 660 2GB Video Card ($237.55 @ Newegg)
Power Supply: SeaSonic 520W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($79.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($15.99 @ SuperBiiz)
Operating System: Microsoft Windows 7 Home Premium SP1 (64-bit) ($90.73 @ Amazon)
Total: $913.25
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-09-16 13:34 EDT-0400)

We'll be picking up the CPU and the MOBO at Microcenter for around $70 less, which leaves us around $840 without the case. I was thinking about the corsair 300r, but maybe some of you have better suggestions? We'll probably get a stock cooler at first, and then a better one down the line, since getting one now puts us a bit over the budget.
I'm planning this build is to be easily upgrade-able with an SSD, a better GPU (the 700 series, possibly), and maybe more RAM in the future. What do you guys think? I'd love some suggestions which might help me save a bit or get better parts. Thanks.