I've got a Radeon 9800Pro & i'm well satisfied with the quality, but if I ever need a new gfx-card I'm going for nVIDIA. I find it hard to stop myself from tearing the card out & throwing it out the window because it is so unstable. ( giving me random black screens, not working properly with TV-out, and so on. )
Well, although WinXP looks better, has more abilities than any other Windows OS, and so on, I really prefer Win2000 above XP. Mainly because of its stability, and compatibility.
Same here,I find HL2 way better than Doom3. I mean, the gfx, the story, ... Although HL2 is getting abit too popular for what it really deserves, I still think it's the best action game ever made