Staples has a good deal on HP p6140f with Intel Core 2 Quad Q8200 2.33GHz; 8GB RAM; 1TB HDD; DVD burner; 802.11n wireless; Vista Home Premium; card reader; 1yr warranty, No Monitor

Free Printer after rebate + use coupon code 54835 for extra $20 off. Total is $529 After coupon, after rebate + tax, ships free.

This is a pretty fast computer for the price.  If you are a gamer, just get a decent video card and you will be good to go.  Qualifes for Windows 7 upgrade.