dual-core never ever. I have got one in the office, and it's slow as hell.,. core2Duo or quad core is much better option these days. your price is nothing special,tbh

lemme show you what I built for my mate 1 month ago, altogether 400Euros>
C2D E6750 2.66Mhz
A-Data Vitesta EE 2GB (kit 2x 1GB) 800+ MHz Z
Arctic Cooling MX-2
Cooler Master Elite 330
Gigabyte ATI Radeon HD 4350 512MB DDR3 GV-R435OC-512I
Gigabyte GA-EP43-S3L (rev.1.0)
LG GH22NP20 SecurDisc
Seagate Barracuda 7200.11 3.5" 500GB ST3500320AS
Seasonic SS-500ET-T3 500W OEM