I can give you a rough setup that I recently built for a friend -
RAIDMAX Quantum case
OCZ ModXStream Pro OCZ700MXSP 700W
ASUS M4A87TD EVO AM3 AMD 870
AMD Phenom II X4 955 Black Edition Deneb 3.2GHz
OCZ Special Ops Edition 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600
LITE-ON Black 24X DVD+R
Samsung Spinpoint 500gb
ASUS CuCore Series EAH5770
If you work the newegg Combo Deals... you should be able to scoop that up for around $600 after tax/shipping (also AFTER about $40-$50 in mail in rebates - so your upfront cost would be around 650 with $50 in rebates)
Do you also need an OS? That will eat $90-$99 of your budget...
Your resolution is low enough that a HD5750 would be sufficient; then even a 500W PSU is more than you need, and a 380W Antec Earthwatts would be sufficient.