A system I'm building for a friend:
CPU: AMD Phenom II X4 965 Black Edition $100
Motherboard: ASUS M5A99FX $155
PSU: Thermaltake TR2 700w $60
RAM: CORSAIR XMS3 8GB $49
GPU: ASUS GTX 650 $125
Monitor: Acer S211HLbd 21.5" $91
Case: NZXT M59 Mid tower $50
SATA: Seagate Barracuda 1TB $70
OS: Windows 7 $100
Disc: ASUS DVD Drive $20
CPU Cooler: Cooler Master Hyper 212 EVO $32
Case Fans:Cooler Master 120mm Blue LED x2 $12
Any comments/ideas to make this build better? And also, his max budget is $800, any part replacements to get this at or under $800?
Better CPU, MUCH BETTER GPU both pretty crucial. Although there is no aftermarket heatsink, that can be added in later, the GPU crushes the GTX 650 easily and the FX-6300 is a large improvement over the older Phenoms and Bulldozer.
That should give you a better CPU and a much more powerful GPU while leaving you the $160 you need for the monitor you picked out plus the Win7 OEM from the link aznshinobi posted, putting you right at your budget cap.
3rd Party HSF and extra case fans aren't really necessary, but could be added at a later date if desired. An SSD would be a nice future upgrade for this system as well.