My video card fried a couple days ago. I was planning to build a new PC within six months, but since I need to replace some components to get what I have operational again anyway, I figured I'd go ahead and get sizable upgrades and reuse the new parts for my new system. I'm very new at any kind of computer building, however, and I'm not sure exactly what I'm looking for to make sure the parts I'm looking at are compatible -- I hear Dell has proprietary connectors for some of their motherboards and power supplies.

Base computer is a factory configured Dell XPS 420, with default motherboard, default 375w power supply, and Nvidia 8800 GT.

I'm looking to purchase Corsair 650W power supply.

I don't think this would be an issue, but also getting GTX 460 graphics card, so if anyone who can help me knows offhand if that would be an issue, that'd help too.

Thanks a ton for the help. If you need any other information let me know and I'll try and get it.

EDIT -- apparently the Dell XPS 420 case and motherboard are proprietary BTX stuff, which by my understanding means I need a new case and motherboard to use that power supply. So: what am I looking for when looking at motherboards? Do any exist that could use both my current Core 2 Quad processor and an i5/i7 down the line? I want to eventually run two video cards, so I'd need an SLI mobo, right?