Mobo and CPU question

Hey there, I'm getting ready to finally order my new system, but as a price cut I was thinking about changing my mobo from a G4-X48 to something cheaper, without crossfire support, but that's as good in quality and has very good OC capabilities, and my CPU from a Q9450 for a Q6600 and OC that.

My question is, what would be the best non-crossfire mobo out there? Preferably the best bang for the buck. Also, to be able to OC my Q6600 to somewhere close to 3.0ghz, would I need aftermarket coolers? I've never used them before, and I'm trying to cut costs wherever possible.

Also, would a 650W PSU be enough for me? My other specs are:
HD4870
4 gigs DDR2 800 gskill
Western Digital Caviar SE16 WD6400AAKS 640GB 7200 RPM SATA 3.0Gb/s Hard Drive

Thanks! =]

ASUS P5Q Pro LGA 775 Intel P45 ATX Intel Motherboard
http://www.newegg.com/Product/Prod [...] 6813131299

has crossfire but it hard to fins a decent board without it and i here that x45 chipsets can oc really good

whats your main focus is it gaming?

for gaming i would get a c2d e8500 and it faster at gaming then most quad cores at stock speed and you can oc it to about 3.8ghz no processor in that price range can get close to it.

but for things like encoding and if your using demanding programs and not gaming quad core is the way to go

A quad would be better yes, you could get a Q6600 for not much more than the E8400/E8500 or switch directly to Q9300/Q9450, but the later 2 cost sensibly more. So you minimally have to ask yourself if you like multi-tasking more than your budget .

The P5Q board support up to FSB1333 (333Mhz) without "overclocking the board itself", the question is if the Q6600 will support it. To that question I have no answer as I own neither the CPU or the board .