I just upgraded from a A64 4000+ single core that was clocked at 3.2Ghz...
Plonked in me Q6600 on monday, spent the last couple days installing windows, just done a bit of overclocking and am now at 3.42Ghz prime stable (well has been for last hour and still goin so we will see but im sure it will end up around the 3.4Ghz mark)...
Anyways, this feels like I'm using the future, I copy a couple of dvds to me hard drive, open winodws media player to watch a movie clip, encode a dvd, browse ie all at the same time and its just SMOOTH....no lag whatsoever
I'd say go for it...
It cost me £350 delivered to upgrade from me old kit (4GB OCZ mem\Q6600\Asus P5K mobo)...
Well chuffed...
EDIT : oh yeah btw, the 3.4Ghz i'm getting is on a really crappy VID of 1.325

so you should easily be able to get that or better with any Q6600 and decent air cooling)
End of the day, the new chips are coming out soon but who cares. The performance difference will be negligable, and the price difference won't be for the good chips. The chips priced around the current Q6600 have a problem because of the multiplier being too low so they won't be able to hit any higher than the 6600...
The newer bits inside the chip give anything from 1%-10% extra performance in benchmarks...
But have a look at the game frame rates!!!? Nigh on identical, no benefit at all
Good riddance AMD, you've shafted us overclockers who were the only ones who spread the word on the company.