GTS Ultra - $500 (not out yet), has 230 MHz DDr and 250 MHz core - fastest card on the planet until the 6k gets released
GTS - $350 (64MB) $275 (32MB), has 166 MHz DDr and 200 Mhz core - very fast card, usually the fastest card (next to ultra)
GeForce2 MX - $125-$175, has SDR and is clocked much slower, but usually can be overclocked to near 200/200. Best budget gaming card out there
all prices in $US