"DOOM III is basically a 'retelling' of the original DOOM .... Most of the game is set on Mars, where you're a marine recently stationed at the Union Aerospace Corporation" excerpt from
this article. No it isn't out yet, and the development team has been using ati's radeon 9700 pro to demo the game stating that it is currently the best performer for the game.
titan, it was probably an
alienware computer, they're a good brand and is one of the next best things you can get to building one yourself. Looked and saw they have a P4 2.8 with 1gig of ram for $4200, get 2 gigs brings the price up to $5000. Personally I'd go with the gig of pc-1066 rdram(not offered in 2gb) which brings it to $4500. Actually if I were to get something like that, i'd buy all the parts myself and put it together which would probably drop the price at least $500.