Ubuntu is still the default favorite for most. Boot the LiveCD and see how much of your hardware works out of the box, that'll give you an idea of how much work you have to do to get everything going.
I'm a Debian zealot, which Ubuntu is based off, but the installer is more verbose (which I like) which tends to scare some people.
And actually if you want you can get WoW running under WINE, supposedly it works pretty well.