I'm going to be the first one to say that you won't get a decent laptop for that budget. Maybe one that you can surf the web for, but not much more... That being said - with almost every laptop, you won't be satisfied for gaming because they just overheat a lot unless you have a really good cooling system. And with THAT being said, invest in a desktop. I thought laptops would be the most amazing thing for wow, just lay down and play, but it's not really as easy as that because it will get VERY hot and overheat. Friend popped out 2400 bucks for an alienware, within a year he had to use the integrated gfx card and was forced to play on low to med settings on wow. Btw, I know it sounds weird seeing as how I just said that gfx card stuff, but WoW for some reason has a lot to do with your processor, its odd.
Anyway that's my 2 cents. Oh and don't get an acer, they're specs are good and prices are low because their quality is minimal. Get an Asus or lenovo.