Being that there is no immediate need for this card since the games in question are out, you can probably wait it out.

The benefit of buying now would be the ability to run any existing game better. I guess this point will depend on how much you play existing games.

Second thought on the matter, how fast is your current processor? These new video cards are pretty dependant on faster processors to help them go. Anything less then a P4 or Athlon XP, and the video card alone won't make for a very decent upgrade.