if you want to see what todays overclockers recommend, I’d check out ocforums.com. They are quite knowledgeable on what to buy 
I just ended up getting a Core2 Duo e6750 for around $200 for a processor
And I used a very recommended IP35-Pro motherboard
You do not need the pro version if you are using only one video card. for SLI, yes.
You definitely want to go with a P35 chipset tho for the Q6600, if that is what you are going with.
Again, check out the forums over at ocforums.com for more info, and research Hell, today, I could be wrong. I purchased the stuff two weeks ago 
They have a motherboard section with people just asking “What motherboard?”