~$700 gaming PC w/o cpu

I am trying to build about $700 gaming pc with my tax return. I am going to be getting a i5-3550 for free and I have been trying to come up with something to go with it that will leave some room for improvement in the future. I would really love to get some opinion. Right now I have this:

http://pcpartpicker.com/p/EPqz

PCPartPicker part list: http://pcpartpicker.com/p/EPqz
Price breakdown by merchant: http://pcpartpicker.com/p/EPqz/by_merchant/
Benchmarks: http://pcpartpicker.com/p/EPqz/benchmarks/

CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($32.98 @ Amazon)
Motherboard: Asus P8Z77-V LE ATX LGA1155 Motherboard ($124.99 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($49.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($62.99 @ Compuvest)
Video Card: XFX Radeon HD 7870 GHz Edition 2GB Video Card ($239.99 @ Newegg)
Case: Cooler Master Storm Enforcer ATX Mid Tower Case ($79.99 @ Newegg)
Power Supply: Rosewill Capstone 450W 80 PLUS Gold Certified ATX12V / EPS12V Power Supply ($64.99 @ Amazon)
Total: $655.92
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-02-20 18:29 EST-0500)