First build in 5 years, opinions..

First off, there's no case. Do you already own a case? If so, which one do you have? Since it's for gaming, you only need 8gb ram. Your psu is overkill unless you are planning to SLI later on. I changed to the liquid cooler to a h100i with the dual radiators. With these changes, you can get a 660ti. I need to know what case you have or if you just forgot to put a case though.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($189.99 @ Microcenter)
CPU Cooler: Corsair H100i 77.0 CFM Liquid CPU Cooler ($99.99 @ Newegg)
Motherboard: Asus P8Z77-V LX ATX LGA1155 Motherboard ($114.99 @ Microcenter)
Memory: G.Skill Sniper Low Voltage Series 8GB (2 x 4GB) DDR3-1600 Memory ($56.99 @ Newegg)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($97.59 @ Outlet PC)
Video Card: MSI GeForce GTX 660 Ti 2GB Video Card ($279.99 @ Microcenter)
Power Supply: XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($54.99 @ Newegg)
Optical Drive: Pioneer BDR-2208 Blu-Ray/DVD/CD Writer ($79.99 @ Newegg)
Total: $974.52
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-02-24 14:00 EST-0500)

Ya sorry forgot to add the case.

Thermaltake VN40006W2N Commander MS-I Snow Edition Tower Case

http://pcpartpicker.com/p/FJ8y

PCPartPicker part list: http://pcpartpicker.com/p/FJ8y
Price breakdown by merchant: http://pcpartpicker.com/p/FJ8y/by_merchant/
Benchmarks: http://pcpartpicker.com/p/FJ8y/benchmarks/

CPU: AMD FX-6100 3.3GHz 6-Core Processor ($109.99 @ Microcenter)
Motherboard: Gigabyte GA-990FXA-UD3 ATX AM3+ Motherboard ($133.98 @ SuperBiiz)
Memory: Corsair Dominator Platinum 8GB (2 x 4GB) DDR3-1866 Memory ($94.98 @ Amazon)
Storage: Samsung 830 Series 64GB 2.5" Solid State Disk ($79.99 @ Newegg)
Storage: Seagate SV35.5 1TB 3.5" 7200RPM Internal Hard Drive ($81.98 @ Outlet PC)
Video Card: XFX Radeon HD 7850 2GB Video Card ($169.99 @ Newegg)
Case: Cooler Master Storm Scout ATX Mid Tower Case ($59.99 @ Newegg)
Power Supply: OCZ ZT 550W 80 PLUS Bronze Certified ATX12V Power Supply ($79.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($18.98 @ Outlet PC)
Total: $829.87
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-02-24 16:55 EST-0500)

What's your budget?

why on earth would you downgrade a 3570 to a 6100?

Why get an H100i for an Ivy Bridge CPU? Even a cheap, lower mid-ranged cooler can get them overclocked to a point where further overclocking won't help gaming and temps are still good.

+1

Why is there Dominator RAM in this build?