i had my 32meg g400 max for almost 3 years and i just recently played jediknight2 (shitty game by the way), MOHAA, Soldier Of Fortune 2 (another shitty raven game btw), Dungeon Siege, and im playing warcraft 3 (warez off of mirc) and Neverwinter. all these games run smooth at 800x600x32. how many other 3 year old cards can do this? TNT2 maybe but thats it.
I think the parhelia will run doom 3 and its contemporary games well enough, the carmack said it would himself, but it might not get the refresh of a gf5 or radeon 3, so what the image will be better quality.
I wont pay 400$ for mine though, ill wait till i can find one on price watch for 200-250.