Naw, I stopped playing WOW like 4 years ago. More like Age of Conan, Hellgate London, and pretty soon Warhammer online when it comes out. But to answer your question these really aren't high end games, I just want to hit at least 60-80 fps on 1900x1200 resolution. Right now I'm getting about 22-25 fps with my 24" in AOC high settings. With my 17" I use to get 30-60.
Well, I suppose Age of Conan
would fit into that more "high-end" category, to be honest, so that game might merit enough reason to perhaps bump it up to a 4870. Just note that in most games, the 4870 posts results around 25% faster than the 4850, while it tends to cost around 50% more.