Sorry bud but if the artifacts still persist, it sounds like the card is giving up the ghost.
As far as new AGP cards go, you don't have much choice but to be ripped off. The best values I could find were a
x1600 pro for $103 and a
7600gs for $120. These cards can hold their own in current games and will still be adequate for another year or two. All of the cheaper new AGP cards are not worth the cost. I just can't recommend anyone spend $75 on a new 6200 or something like that. If you are looking for something sub $100, I would see if you can pick up a used card somewhere. I do my buying/selling/trading
here. If you make a post with what you are looking for and I'm sure someone will be able to accommodate.
Wish I had had better news man.
...bysmitty