It wasn't so much as waiting for the prices of the 6600's to drop, but for the prices of the 6800's to drop. But if it's only going to be a partial upgrade (not an entirely new card), then you're right, might as well buy now and get as much life out of the card as possible.
I'm currently planning upgrades for my pc in anticipation for Battlefield 2. One of those upgrades will be a new video card. Right now the choice is obvious...6600 GT. But I know as soon as I shell out the green for a new graphics card, ATI or Nvidia will announce a new card. If ATI or Nvidia...