This is the build I had in mind after some research:
CPU: AMD Phenom II X4 955 BE - $148
MOBO: Asus M4A87TD-US3 - $96
HDD: Samsung Spinpoint 1TB - $58
PSU: Antec Neo Eco 520C - $72
CPU HSF: Coolermaster Universal Hyper 212+ - $33
GPU:Gigabyte 2GB ATI HD6950 - $293
RAM: Kingston 4GB DDR3-1333 - $44
ODD: Liteon DVD Burner - $30
Antec 300 - $56
Total = $830
I have OS and peripherals.
I was also thinking of getting 8GB ram instead but not sure which one exactly would be good quality for a reasonable price. I heard G.Skill would be good but im not sure which 8GB set would be compatible.
Also, is the power supply enough? I dont think I will overclock. My alternative was the Antec True Power 650W.
Change the i3 2100 to the i5 2400. That'll put $600 @ $670. Then change the graphics card to the 6870 or the 6950. That'll increase $670 to around $750. That'd fit your budget, oh add $30 for the CD/DVD and you have $780