I have a 15" 1.5 from the last gen w/ the 128mb 9700. I play WoW all the time and it plays great on the powerbook. Have all the settings maxed but w/ the distance turned down. I do have a gaming PC but I left it at home (in my sig). There is no reason that I need it for this game. I frequently play it in windowed mode on a second monitor while I talk to people and browse the net on the powerbook monitor... still runs very nicely. Lag is expected in some areas, like Iron Forge; however, if I go on during lower population times it isn't laggy since my ping is again decent. I personally love the convienence of a sub 6 pound computer with a screen this size... not to mention the great OS, tons of useful features, etc...

WoW should not be a concern when buying a computer... however the 17" w/ the 128mb card should play it fine!