What agp graphics card should i buy?

i believe my graphics card is going out, and i'm probably going to need to buy a new one. my current card is nvidia geforce4 ti4600, my cpu is amd athlon xp 2200+ 180ghz, and i have 2gb of ram. i only have agp on my motherboard. what is a good agp card to get that will work well with my cpu?