Having played WoW on a few PCs lower spec than yours, I'd say no problem. I last played it on an Acer 6930G with the ATI 512MB graphics card (3650M? Can't remember exactly, but something like that). It was fine with that, although it did start to struggle a bit after the Cata release and corresponding graphics update.
However, I believe some people have issues running WoW with the GTX 460. Whether that's resolved and/or extends to the mobile version of the card, I don't know. It's be worth checking out in the WoW forums before you part with your hard-earned.