I've been looking around a lot on newegg, tigerdirect and so far this is what I've come up with. My budget is $800 and most of the stuff I found were on Amazon which offers free shipping.
GAMMA Classic Series ATX Mid Tower Interior Steel Chassis (Black) ($40)
http://www.amazon.com/gp/product/B002UDK9U6/ref=ord_cart_shr?ie=UTF8&m=ATVPDKIKX0DER
MSI AM3 AMD 870 125W-CPU Support 2 PCIEx16/1 PCIEx1/3 PCI 870-G45 ATX Motherboard ($64)
http://www.amazon.com/gp/product/B003UT0S1E/ref=ord_cart_shr?ie=UTF8&m=A2YLYLTN75J8LR
AMD Phenom II X4 955 Black Edition ($140)
http://www.amazon.com/gp/product/B002TQYUAE/ref=ord_cart_shr?ie=UTF8&m=ATVPDKIKX0DER
Corsair CMPSU-750TX 750-Watt TX Series 80 Plus Certified Power Supply compatible with Intel Core i7 and Core i5 ($110)
http://www.amazon.com/gp/product/B000X2677A/ref=ord_cart_shr?ie=UTF8&m=ATVPDKIKX0DER
Western Digital Caviar Blue 500 GB ($40)
http://www.amazon.com/gp/product/B000Q82PIQ/ref=ord_cart_shr?ie=UTF8&m=ATVPDKIKX0DER
Corsair CMZ4GX3M1A1600C9 Vengeance 4GB DDR3 RAM - PC12800, 1600MHz, 1x4096MB, Non-ECC, Unbuffered($40 after rebate
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=7025808&sku=C13-5700
Sapphire 100314-2SR Radeon HD 6870 Video Card - 1GB, GDDR5($180 after rebate)
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=7171596&sku=A271-6872
Samsung 2333T 23" Class Widescreen LCD HD Monitor - 1080p ( $150)
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=7271017&sku=S203-2333
About $750 with shipping
As far as the build I'm pretty sure its capable of running Crysis 2 on 1920x1080 on max admirably. I'm still unsure whether its a better idea to get a better card and get a cheaper mobo and psu to only support one gpu. But will all these parts be compatible and if there's any other recommendations, thanks in advance.
GAMMA Classic Series ATX Mid Tower Interior Steel Chassis (Black) ($40)
http://www.amazon.com/gp/product/B002UDK9U6/ref=ord_cart_shr?ie=UTF8&m=ATVPDKIKX0DER
MSI AM3 AMD 870 125W-CPU Support 2 PCIEx16/1 PCIEx1/3 PCI 870-G45 ATX Motherboard ($64)
http://www.amazon.com/gp/product/B003UT0S1E/ref=ord_cart_shr?ie=UTF8&m=A2YLYLTN75J8LR
AMD Phenom II X4 955 Black Edition ($140)
http://www.amazon.com/gp/product/B002TQYUAE/ref=ord_cart_shr?ie=UTF8&m=ATVPDKIKX0DER
Corsair CMPSU-750TX 750-Watt TX Series 80 Plus Certified Power Supply compatible with Intel Core i7 and Core i5 ($110)
http://www.amazon.com/gp/product/B000X2677A/ref=ord_cart_shr?ie=UTF8&m=ATVPDKIKX0DER
Western Digital Caviar Blue 500 GB ($40)
http://www.amazon.com/gp/product/B000Q82PIQ/ref=ord_cart_shr?ie=UTF8&m=ATVPDKIKX0DER
Corsair CMZ4GX3M1A1600C9 Vengeance 4GB DDR3 RAM - PC12800, 1600MHz, 1x4096MB, Non-ECC, Unbuffered($40 after rebate
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=7025808&sku=C13-5700
Sapphire 100314-2SR Radeon HD 6870 Video Card - 1GB, GDDR5($180 after rebate)
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=7171596&sku=A271-6872
Samsung 2333T 23" Class Widescreen LCD HD Monitor - 1080p ( $150)
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=7271017&sku=S203-2333
About $750 with shipping
As far as the build I'm pretty sure its capable of running Crysis 2 on 1920x1080 on max admirably. I'm still unsure whether its a better idea to get a better card and get a cheaper mobo and psu to only support one gpu. But will all these parts be compatible and if there's any other recommendations, thanks in advance.