If I have to go down that route I'll just get a new motherboard and i5 CPU. I don't see the point in purchasing another CPU and running the risk my motherboard won't support VT-x. I might as well get hardware I know will definitely support it. I'll just use this Dell as a media centre in a smaller case or something - It'll be more than up to the task.
Let's see how I get on with this Crysis demo first! You never know, I might enjoy it!
EDIT: just tried Crysis... Its actually pretty good, though I'm still trying to get my head around the idea of using a keyboard and mouse to game!
I checked the graphics, and it seemed happy with 1024x800 (I think its 800), 2x anti-aliasing, and in the advanced menu everything set to high. The video intro's gave a few lines as it played, but the game ran perfectly fine, no ghosting, or slowdown of any kind. I did the optimal settings thing where it chooses the best settings, except I added 2x anti-alisaing.
My CPU wasn't really running even 40% load most of the time, and temps (using HWMonitor) were around 50-55'C on the 4 cores, and GPU maxed out at 67'C. The GPU load is 100% all the time though - Is that normal?
Overall, I'm actually pretty impressed my PC handled it so well!
EDIT EDIT: I've just spent the last couple of hours playing it at 1680x1050 without a single glitch whatsoever (CPU was nudging 60'C and GPU 71'C by then). I'm actually stunned, I see what everyone means by PC's having good graphics now. P.S. Time to order Crysis I think!