I currently have 1.8 Ghz core 2 duo lga 775 and a radeon 5450
im looking to upgrade to a core 2 quad but do not know wheter to buy a new mobo nd cpu or keep the old one and aslo a gpu ive been looking at the gtx 460 gtx 550ti gts 450 im on a budget 500-600 saying i never upgrade my comp ill like amazon or newgg would best. may buy around next month.
If you're prepared to buy a new MB and/or CPU it makes little sense to even look for a 775 compatible if you could find it. Start looking at Sandy bridge or Ivy Bridge components. I think you'll find plenty in your budget range.