You might also want to consider the 8400. Unless you decide to go with the P4 Extreme Edition, the only advantages the XPS offers are a bit more expandability due to a higher output powersupply and better cooling along with an extra PCI slot, and firewire ports.

For me I didn't see the value in the XPS. I'll probably end up upgrading the video card, and probably adding an additional HD. I didn't have any need for firewire, and IMO, 3 PCI slots are more than I need.

I'd suggest just watching the sites like gotapex.com and BensBargains.net, also make sure to check out the newspaper deals in the "as advertised" section of Dell's website. TV deals are all low-end, but they have some nice deals under newspaper where they're throwing in disk upgrades or something. Dell seems to have cycles, they'll have great deals one week, then they'll cool off for a couple. If you can handle waiting, you can get a stellar deal.