Thanks for the advice
As to the P45: I'll look at it, but it seems to only have space for one IDE, and I'm fairly sure that both of my opticals are IDE, plus FDD which I want to keep.
For the processor, what's the Q8400 like? It seems decently priced and has a good clock rate for single threaded games, and when the time comes the other cores will kick in. But, what AMD ranges should I look in for what I need, Phenom or X2?
BadTrip: That graphics card is two years newer than the processor, which is single core and doesn't have a good clock speed at that, so surely RAM+CPU would be a better upgrade?
I'm haven't settled on AMD vs Intel etc, this is just what I've been looking at.