i got radeon ve for around $100CAN (this was a while ago, prolly cheaper now). this card was put down by lotsa ppl around the net, but i found it quite good for n64 emu and many other games. its also got the hydravision(support 2monitors{its not special anymore though, Radeon 8500 and others also hav it})
plain GeForce 2 cards can be very cheap nowadays i think i could get one for about $50(CAN)