I've been wondering why people don't do this for a while but since I only just registered I've waited until now.

Loads of people are needing a res of 800x480 and using powerstrip or whatever to do it. Why don't you edit the .inf driver file before installing your nvidia drivers.
eg.
HKR,"MODES\32\640,480"
HKR,"MODES\32\800,480"
HKR,"MODES\32\800,600"