At $100 now, the card is a good deal. It won't drop to $50-75 bucks for a long while and you can get alot of use out of it now.
If it was $200-300 and it dropped $100-150 bucks, like the GF4 will probably do after the new NV30 comes out, then you would lose but when it's this cheap for a good piece of hardware, I say go for it. The price is right now!