I do not have either computer but was considering the same choices as well. The main things that you should use in making your choice are the type of processor and type of video card. The XPS 9000 uses the i7 processors, so if you get one with the highest end processor and the nVidia GTX260, you'll have more than enough power for everything you need. I believe they come with a 475 W PSU. However, it could get hotter, so the fan noise could be louder.
The XPS 8000 uses the newest Lynnfield processors, which are more efficient and less power hungry than the ones offered in the XPS 9000, but are still pretty fast. You could build it with the same GTX260 card in, but the PSU is only 350 watts. Little less power, but more efficient and quieter. That said, it could still serve your needs.
I'm leaning towards the XPS 9000 myself. I always like nVidia graphcis cards over ATI, but for speed, Dell won't offer anything higher than the nVidia GTX260 since it would take too much power that the PSU offered in either one couldn't probably supply under load.
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