As a 775 user, I recommend forgetting about it and moving on. There's really weak SSD and TRIM support for a lot of 775 chipsets and it's a dead technology. You'll also be hard-pressed to find a motherboard with DDR3 in it. Just save the money and buy a cheap Sandy Bridge rig.
The Q6600 is also pretty weak in terms of OC'ability if I recall correct. I recommend picking up a high Q9XXX series, preferrably a Q9550 or Q9650. You could probably get a good deal here on OCN on one of the two. I'm got my Q9550 at 3.54GHz right now and that's not even pushed.
EDIT: That said, I'd probably recommend this
one, but that's without checking eBay or anything for motherboards that may not be produced anymore. I like Gigabyte a lot, especially for the 775 socket, and this motherboard has DDR3 capability and a decent price tag. Most 775 motherboards, I've found, tend to be micro-ATX or mini-ITX these days as a lot of the 775 chips are going into HTPCs or small-form-factor builds.Edited by CasanovaFly - 6/8/11 at 12:43pm