Well the 45nms are coming out: http://www.computerforum.com/98406-intel-45nm-cpus-price-list.html. When they do come out, the Q6600's price will drop a lot, but I'm considering the Q9450, as it is about as much as the Q6600 now.
Can you wait? If you can, you should.
I'm looking up info on your mobo and I'm not finding anything that says it is 45nm ready as it is a 965 chipset. I don't think you'll be able upgrade to the new cpu's anyway.