For Doom 3, what I meant was that it isn't as dependent on some of the more advanced DX9 features as HL2 is. To more properly explain:
John Carmack wrote: Unfortunately, [Half-Life 2] will probably be representative of most DX9 games...[Lowering precision] doesn't really matter to Doom, but that won't be a resonable option in future games designed around DX9-level hardware as a minimum spec.
Quote taken from Maximum PC, Nov. 2003.
For me, at least, the ATI vs. nVidia comes down to only 2 things:
2) Driver stability (for Linux, not Windows).
The nVidia 5900 looks like the best for both; I will be getting one. Now I just gotta figure out which brand
Right now I have an nVidia GeForce 2 Ti hooked to a crappy 15" monitor. So it'll be a nice upgrade! (And yeah, I'm getting a new monitor too...newegg has a nice 19" Samsung for under $200 right now).
There's only a small handfull of games I care about: UT2K3 (4?), Doom 3, BF1942. Maybe a couple of others. Other than Doom3, nothing to stressful for the system (judging by how they run on my system right now, anyway).
Soon to be proud user of Mandrake 10 (again!). SuSE 9 sucks!