I say this since even though that chip is going for $1000 at NCIX it certainly is not worth it. You will get better performance from a new i7 2600K. This is even more so important since you said you would need to get a new motherboard and ram anyways. Plus the new chip with motherboard and ram should only be about $1000 give or take. So really you are much better off keeping the camera. Don't trade it for that, the other guy would be getting the better bargain.
"Nothing sucks more than that moment during an argument when you realize you're wrong."
I remember a camera similar to this a few years ago (perhaps its the same model? not sure, my memory is not so good these days), it performed pretty darn well.
Personally I would NOT trade the camera for THAT processor.
But its totally up to you.
Who knows, maybe you'll get a better offer?