I'll probly just get a new system together then. Right now I'm lookin at a 8600GT, a Core 2 Duo at 2.66, new mobo, and I'd like to get some newer ram in the 2gigs but don't know if I should go Kingston or Corsair and wat the difference between ddr800 and ddr1200 is. The reason im opting for the 8600gt is because I don't really need anything superpowerful atm and its a lot cheaper and when I do need more I can just buy another and link em, or would it be better to just get a 8800 right off the bat. All together im around 850-900 right now with avg prices on newegg.
Go Corsair if you can afford it and get 2 Gigs. Corsair is still beating out all others in head to head tests.
Don't buy a video card with the thought that some day you might set up SLI. Video cards change too quickly for that and honestly, dual card setups are still not proven to do it better anyway. A lot of mobos split the bandwidth between them rather than double it.
The difference between the DDR speeds (800, 1200, etc.) is the speed of the RAM access. The higher the number the better, but you also need to look at CAS settings. The lower the numbers the better.
Before you buy anything, send me the newegg part numbers and I'll see if I can beat them on anything. Newegg isn't always the cheapest.