I'm not sure what your price range is, but this is a really good HP with 4 Gigs RAM, intel quad core for 900 dollars. It's a great computer for the price and will probably last you a while.
http://www.circuitcity.com/ssm/HP-Pa...oductDetail.do
Here's one with similar stats but its cheaper by 200 dollars
http://www.circuitcity.com/ssm/iBUYP...oductDetail.do