Which video card will maximize my World of Warcraft experience?

Well if your running a Nvidia FX 5500 now(its an AGP slot card) the 6600 is better than the 6200 but look for a 6800gt. The best you can buy for an AGP slot is a BFG brand Nvidia Geforce 7800gs OC edition video card. They are hard to find because they dont make them new anymore but if you look on Ebay or your local craigslist you may find a used 1. I have the 7800gs in my backup PC & a 6800gt in a box in my bedroom.