since you're leaving it at stock speed, pretty much any mobo will do. if you dont need any SLI or crossfire, you can even get a mATX in the $60 range for cheap. but i would probably suggest to OC it. 4.0ghz is pretty much standard for an e8400, but would require a mobo in the $100 range. you'll notice the difference from 2.6ghz to 4ghz