P45 and although most people don't recommend the Biostar mobos i'm very happy with mine, very easy to use and posted no problem. Alternate choice would be a Gigabytpe P45 DS3L at $108 or an Asus P5Q at $130 (Asus seems to have done a good job on the P45 boards)
Biostar TP43HP. P43/45 hits 400fsb with no sweat whatsoever. If you're overclocking a Q6600, you'll be able to reach 3.2ghz, assuming you get a decent chip, without any hassle. This board is cheap, has nice heatpipe cooling, very easy OC features, and it isn't Asus-YAYY!
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