Help please trying to build first Gaming PC

I'll give you an 800 and 1000 dollar rigs that I have designed myself. First is the 1000.00 rig:

PCPartPicker part list: http://pcpartpicker.com/p/3c4CN
Price breakdown by merchant: http://pcpartpicker.com/p/3c4CN/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3c4CN/benchmarks/

CPU: AMD FX-8320 3.5GHz 8-Core Processor ($159.99 @ Newegg)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.99 @ NCIX US)
Motherboard: Gigabyte GA-990FXA-UD3 ATX AM3+ Motherboard ($129.00 @ Newegg)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($79.99 @ Amazon)
Storage: Samsung Spinpoint F1 DT 750GB 3.5" 7200RPM Internal Hard Drive ($75.20 @ Amazon)
Video Card: EVGA GeForce GTX 660 2GB Video Card ($209.98 @ SuperBiiz)
Case: Cooler Master HAF 922 ATX Mid Tower Case ($89.99 @ Amazon)
Power Supply: Corsair RM 550W 80+ Gold Certified Fully-Modular ATX Power Supply ($99.98 @ OutletPC)
Optical Drive: Asus BW-12B1ST/BLK/G/AS Blu-Ray/DVD/CD Writer ($60.98 @ Newegg)
Operating System: Microsoft Windows 8.1 - 64-bit (OEM) (64-bit) ($97.26 @ OutletPC)
Total: $1012.36
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-20 22:12 EDT-0400)


Now the 800.00 rig:

PCPartPicker part list: http://pcpartpicker.com/p/3cHjX
Price breakdown by merchant: http://pcpartpicker.com/p/3cHjX/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3cHjX/benchmarks/

CPU: AMD FX-8320 3.5GHz 8-Core Processor ($152.98 @ SuperBiiz)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.99 @ NCIX US)
Motherboard: Gigabyte GA-970A-D3P ATX AM3+/AM3 Motherboard ($89.99 @ Newegg)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($82.99 @ Newegg)
Storage: Western Digital WD Blue 500GB 2.5" 5400RPM Internal Hard Drive ($50.92 @ Amazon)
Video Card: EVGA GeForce GTX 660 2GB Video Card ($209.98 @ SuperBiiz)
Case: Cooler Master HAF 912 ATX Mid Tower Case ($49.99 @ Micro Center)
Power Supply: Corsair CX 500W 80+ Bronze Certified Semi-Modular ATX Power Supply ($49.99 @ Newegg)
Optical Drive: LG GH24NS95 DVD/CD Writer ($21.98 @ OutletPC)
Operating System: Microsoft Windows 8.1 - 64-bit (OEM) (64-bit) ($97.26 @ OutletPC)
Total: $816.07
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-20 22:30 EDT-0400)