This is a pretty good Canadian online store. About as close to Newegg with avalible components. I like the Coolermaster Half X case.
Lots of features, good air flow and I'm partial to the all black interior http://ncix.com/products/index.php?s...e=COOLERMASTER
I also like the GTX460 GPU.
As far as your current CPU visit some of the Overcloking forums and you'll find the Q6600 especialy the GO stepping to do ectremely well.
One of the easiest preformace gains would to get an SSD for you OP system. Their is still some good life left in some of your components it's just a matter of how much you want to spend. And 4 gigs or more of ram is enough to run a 64 bit Os. NCIX.com - Canada's Premier Computer Store - Great Technology, Service and Selection.
Just some thougts. Fabe