Assuming I don't fall in love with the xbox360 and decide to get that instead of a new pc (I doubt that will happen), I think I've decided on this:
Antec P180 case
Antec NeoHE 430W
or Antec SmartPower 2.0 400W
or Antec TRUEPOWERII 430W
DFI LanParty UT nF4 Ultra-D mobo
AMD Athlon 64 3700+ San Diego CPU
eVGA Geforce 6800GT
Maxtor DiamondMax 200GB hdd
BenQ DVD Burner
Windows XP Media Center
I'm just going to buy the case, cpu, video card, mobo, and os for now. The rest can wait until I have the money.
For now I'm keeping the memory I have, but later I'm going to buy some good memory, a tv tuner card, and a remote for windows media center.
I'm going to look at a few stores around here for decent case that's relatively cheap. I was thinking about one of the cheaper coolermaster cases, they don't look bad and are half the price of the p180. What I'm really looking for in a case is a top fan to go along with the front and rear fans... heat rises so it doesn't make sense to trap it in there. I was thinking the rear and top fans would be exhaust, and the front would be intake. I read that a 'vacuum' effect was best for cooling cases.
Btw, I have a monitor, speakers, keyboard, mouse, etc.
Edit: Will I need to buy a new heatsink or fan or anything for either the cpu or video card? I don't plan on overclocking until I buy some high end memory which will be at least a few months off.