I do have to say, now that the I7 core is out, and was rather fast happening too, that I feel a bit stupid, going for a Q6600 when I did.
That said though, it has speeded up a lot of the processes I do every day, compared to what a Dual Core would have done, but it would have been a cheaper build.
Plus, I doubt I'll upgrade the CPU for a good few years yet, and who knows, maybe AMD will catch up this time
The Socket 775 is now offically dead it would seem.
The Q8200 to me seems a bit excessive. Theres no real need to go past a Q6600 for standard use. The higher clocked/unlocked versions of processors, in my opinion are not worth the very high premium.
I'd go for at the most, a Q6600, a pretty good video card (ATI 4870 would be a nice bet), and around 2-4GB's of RAM. That would set you for a good few years, at a budget.