You'd proberbly get around 30-35FPS on WOW, if you put the settings way down.
My guess is that you'd get similar results on Counter Strike Source... But dont take my word for it.
If you found a laptop with a 9600M then you'd be OK, but I dont know if you could do that on your budget.
- That should play some games... But dont get it until other people have had an input