[kupoartist]

To run it with "those" graphics, you're going to need a beefy system. However, its worth remembering that its not those graphics or nothing.

Take Unreal 2. It runs at a respectable 30fps on My Athlon TBird 900 / 64mb GeForce / 512Mb PC133 Ram. but it looks like... its a bog-standard X-Box game. Nothing fancy graphically, but its playable, and still possible to go "wow" at points. Doom III, is the next thing on from Unreal II graphically, so I expect to be playing with all settings on low and he worst resolution imaginable. But it will probably still play well.

Dan, with your current system, you'll probably be on the middle level. Don't expect to put all the detail settings to "highest", and you shouldn't get any problems. If you want to get some more performance out of it, stick some more RAM in for sure. Don't bother with the processor (even getting a 3Ghz Processor won't speed it up a lot... especially given the £1,000 + close relative asking price). Only consider getting a new GFX card if you've got a GeForce 2 or below.

and on the subject of Doom III, i'm not that excited really. ID Software have never made a decent and involving game, all those they did were liked at the time because there simply was nothing better. ID Software make 3D engines for others to do wonderful things with....

Edit; oh and remember that "GeForce 4 MX" is another way of saying "GeForce 2 GTS"... get the GeForce 4 Ti4200 if you don't want to spend too much.