Which graphic cards is best for WoW? and some question on pixel shader, vertex shader and supplementary power?

Well I play wow but I'm no expert unfortunately my husband is but you just had to ask this question while he was out of town. I'll tell you what we have and it is perfect, everthing runs smooth no lagging and you can see every detail in the game. We ahve the nivida gforce 9600. It was about $200 bucks but really worth it. Hope this helps a little