Honestly just check slickdeals and watch for a deal on a budget gaming rig. I got a dell desktop for $289. core i3-2100, 4gb ddr3, 1tb 7200rpm drive, wireless n, and optical drive. I put in a corsair 550w psu i got for $35 after rebate, 8gb patriot ddr3 i got for $15 after rebate and a radeon 6770 i got for $70 after rebate. So basically a little over $400 for a decent budget gaming rig. Laptops are just not worth the hassle of upgrading. Save the $100 you'd blow on a card and just put it towards a new desktop.