Leon, you're thinking incorrectly. Start from the beginning of all nVidia cards and work your way up from there... 6 months after you have a new card, then 6 more month--much better card....
so GeForce3 have a healthy boost in performance and technology right? GeForce4 offers benefits only if you're using AA right? Now, the upcoming nv30-based cards should, if nVidia continues to follow the 6month cycle with 1 year between "significantly better" cards, be the one to open up more eyes.