>>>256MB Nvidia GeForce 8600GT video card
This isn't the highest video card you could get. If you were only a mild gamer this wouldn't be to bad. You want to get 8800 (they come in like 3 or 4 models). Also the bigger your screen is more memory you have the better. These can come up to 640 mb. ATI also has a new card the 2900 XT that comes in 512mb or 1 Gb. Then its a matter if you want to run SLI (Two Nvidia cards together) or crossfire (two ATI cards together, this would be a better option then the PhysX card, not many games use this) In short... if you really are this big into gaming get at a Nvidia 8800. I got a 8800gt with 320mb and I'm running fine on a 22" widescreen (the 320 version is like $140 less). but I was building my machine. you well have to shop around or see if you can upgrade the dell.
I'm looking at buing a new Desktop computer. I game a lot, probably going to be playing The Orange Box from Half-Life and when Warhammer comes out will be playing that quite a bit. So I am looking for a good gaming machine for a good price. My budget is around 1600 Dollars. I have looked at the Dell XPS 410 with Intel Core 2 Q6600 Quad-Core(8MB L2 Chache, 2.4 GHz, WIndows Vista, 2GB Dual Channel DDR2 800MHZ, 320GB Searial ATA 3GB/s Hard Drive 7200 RPM,48x Duel combo drive, 256MB Nvidia GeForce 8600GT video card, AGEIA PhysX Physics accelerator. This set up gets priced out at about 1525 dollars. Will this be a good set up for gaming with good graphics and little to no lag? Is there other pcs out there that offer more for around the same price tag? And with those specs do you recommend upgrading any component to increase performance.