From Gamespot's review:
"The GeForce 6600 GT handily outperforms the Radeon 9800 Pro in all the tests, and we have no problem naming the GeForce 6600 GT AGP our new value-card selection.
Depending on card supplies in the weeks following launch, we will likely see GeForce 6600 GT AGP prices stay above $200, since the new card will generate significant interest among the large number of AGP-system owners looking for a video-card upgrade. We're hoping that we'll also see the Radeon X700 XT AGP before the holidays, but that seems unlikely."
I'm waiting until this card comes out:
http://www.bfgtech.com/6600GT.html