what is the best laptop or notebook to buy? Does apple OS allow ...

what is the best laptop or notebook to buy? Does apple OS allow for online gaming like MMORPGs and the like? Can't I have a dual OS installed so i can have both Mac and MS? I like mac's features with the movie and firefox, ... my friend has a $1200 asus that can handle crysis, and I'm typing this on a 4 year old hp that can handle oblivion. vista has been regarded as glitchy and terrible, but as long as you have a decent computer to run it, it really is awesome. ...