Here's my setup to get you a ball park idea, but you'll get different results. Mostly because of our different hardware config and you never know the OC capability of the CPU. I highly recommend taking it slow, stress testing, reading the stickys if you are confused and KNOW THE RISKS!
PSU: Antec Earthwatts 650
Mobo: Asus P5K-SE (p35 northbridge)
CPU: E8200 @ 3.6 with 1.325 volts (vdroops to 1.3 under load via Prime95)
RAM: Kingston DDR2 1066 running @ 1081Mhz (i forget what ratio i used)
GPU: 8800GT @ 700 Mhz core
Pulls ~13500 in 3DMark 06.