heh...I can't get you Carmack but i can get you his attorney. Just go around stating your were the one who leaked Doom 3 Alpha in corporate emails to ID Software. Then you'll be sure to get a call.
UAC if you really want a card for doom 3 and doom 3 only you will wait for next gen cards to come.
GF 5950 FX is probably fastest card out now in doom 3 but that is ignoring IQ completely.
Wanna know the real reason doom 3 is late its cause everyone second doom fan is spamming him with emails. ( Oh and cause I hacked the Doom 3 source and pre-gold release ).