GF3 and R8500 are both good choices. It depends on your brand preference, I guess. Some don't like ATi drivers, but the R8500 is indeed faster than the GF3 Ti200. In addition, this weekend, CPU prices drop. You may be able to pick up an 1800+ after this weekend for the cost of a 1700+ now.
GF4 cards are coming soon. Wait for them to come out b4 getting a video card. They'll probably send Ti200 and R8500 prices down.