Both the ti4200 and the radeon 8500 are pretty good buys right now. Off pricewatch, you can get the 8500 oem cards for under $100, (the lowest is $85), while the ti4200s can be had for about $145. New cards by ATI and nvidia will drive down the top end parts, but I'd be suprised if either of these will come down much (you may eventually see the ti4200 come down closer to $100). As someone else mentioned in another thread, it's a pretty bad time to buy the topend stuff, but the lower end (or simply older) stuff is pretty cheap atm.
Nite_Hawk