Under $850 budget gaming PC parts. Suggestions/Compatible?

[ianjakobkaufman]

Hello! I am building a budget gaming PC that will also be used for simple video viewing (Hulu) and web browsing/schoolwork. Games I want to play are mainly Source games (tf2, cs:s etc.) and gta IV. Bioshock comes with the GPU so that too . I also plan to run Windows 8 (don't try to convince me to use windows 7 instead ) The parts I have chosen are here http://pcpartpicker.com/p/JoMa , but i also listed them below. Do you like it? Any recommended changes that wouldn't drive the cost up a lot? Any ways to cut costs but still be as good? Thank you so much!
CPU
http://us.ncix.com/products/?usaffiliateid=1000031504&sku=76935&vpn=FD4300WMHKBOX&manufacture=AMD&promoid=1323
Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131872&nm_mc=AFC-C8Junction&cm_sp=&AID=10446076&PID=3938566&SID=
RAM
http://us.ncix.com/products/?usaffiliateid=1000031504&sku=70136&vpn=KHX1600C9D3B1K2%2F8GX&manufacture=Kingston
HDD
http://www.amazon.com/dp/B00461G3MS/?tag=pcpapi-20
GPU
http://us.ncix.com/products/?usaffiliateid=1000031504&sku=77602&vpn=FX-785A-CNL4&manufacture=XFX&promoid=1323
Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139026&nm_mc=AFC-C8Junction&cm_sp=&AID=10446076&PID=3938566&SID=
Case
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119227&nm_mc=AFC-C8Junction&cm_sp=&AID=10446076&PID=3938566&SID=
Extra case fan
http://www.newegg.com/Product/Product.aspx?Item=N82E16835553001&nm_mc=AFC-C8Junction&cm_sp=&AID=10446076&PID=3938566&SID=
Optical Drive
http://www.newegg.com/Product/Product.aspx?Item=N82E16827106289&nm_mc=AFC-C8Junction&cm_sp=&AID=10446076&PID=3938566&SID=
Monitor
http://www.newegg.com/Product/Product.aspx?Item=N82E16824116565&nm_mc=AFC-C8Junction&cm_sp=&AID=10446076&PID=3938566&SID=
Wireless adapter
http://www.amazon.com/gp/product/B002RM08RE/ref=ox_sc_act_title_7?ie=UTF8&psc=1&smid=A1DCPNQKKEISZB
speakers
http://www.amazon.com/gp/product/B0025VKUQG/ref=ox_sc_act_title_6?ie=UTF8&psc=1&smid=A1E8AJDELN2AKR

 

[bodeen2012]

PCPartPicker part list: http://pcpartpicker.com/p/JC2k
Price breakdown by merchant: http://pcpartpicker.com/p/JC2k/by_merchant/
Benchmarks: http://pcpartpicker.com/p/JC2k/benchmarks/

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($119.99 @ Microcenter)
Motherboard: ASRock 970DE3/U3S3 ATX AM3+ Motherboard ($69.99 @ Amazon)
Memory: Kingston Blu Red Series 8GB (2 x 4GB) DDR3-1600 Memory ($42.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($67.99 @ NCIX US)
Video Card: HIS Radeon HD 7850 2GB Video Card ($179.99 @ Amazon)
Case: BitFenix Merc Alpha (Black) ATX Mid Tower Case ($39.99 @ NCIX US)
Power Supply: Corsair Builder 500W 80 PLUS Bronze Certified ATX12V Power Supply ($39.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($15.98 @ Outlet PC)
Operating System: Microsoft Windows 8 (OEM) (64-bit) ($89.98 @ Outlet PC)
Monitor: LG E2211T-BN 22.0" Monitor ($118.84 @ Compuvest)
Total: $785.73
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-03-14 05:05 EDT-0400)

 

[ianjakobkaufman]

PCPartPicker part list: http://pcpartpicker.com/p/JC2k
Price breakdown by merchant: http://pcpartpicker.com/p/JC2k/by_merchant/
Benchmarks: http://pcpartpicker.com/p/JC2k/benchmarks/

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($119.99 @ Microcenter)
Motherboard: ASRock 970DE3/U3S3 ATX AM3+ Motherboard ($69.99 @ Amazon)
Memory: Kingston Blu Red Series 8GB (2 x 4GB) DDR3-1600 Memory ($42.99 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($67.99 @ NCIX US)
Video Card: HIS Radeon HD 7850 2GB Video Card ($179.99 @ Amazon)
Case: BitFenix Merc Alpha (Black) ATX Mid Tower Case ($39.99 @ NCIX US)
Power Supply: Corsair Builder 500W 80 PLUS Bronze Certified ATX12V Power Supply ($39.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($15.98 @ Outlet PC)
Operating System: Microsoft Windows 8 (OEM) (64-bit) ($89.98 @ Outlet PC)
Monitor: LG E2211T-BN 22.0" Monitor ($118.84 @ Compuvest)
Total: $785.73
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-03-14 05:05 EDT-0400)

what's the difference between the GPUs? And do i need a higher power supply? Thanks