Ti 450? that must be one card maker's gimmick name.
GF2 Ti whatever is still a GF2.
get the Visiontek GF3 Ti200 this fri at bestbuy for $100 after rebate,
even a regular GF3 or Ti200 is at around $170 online price, $200 local retail stores now, the price will go down eventually, that makes those $100+ GF2 whatever not a good buy, that also makes those $70-100 MX400 be a joke.
except the $70 GTS-V is ok to consider if you're just occassional gamer.