If you're up for overclocking, an E5200 should do you just fine and it'll probably overclock really well too. Maybe consider going for Denithor's suggestion and adding an aftermarket cooler to help with the overclock. The Xigmatek HDT-S1283 is good for the price (under $40 and includes a fan), while the Thermalright Ultra 120 Extreme (TRUE for short) is one of the best higher-end ones but it runs around $50 and you have to buy a fan yourself.