DynAudio really, still don't think that would be particularly a great selling point the limited size of the speaker enclosures in a laptop will still be a massive hindrance. Still better off getting some cheap satellite speakers.
I think that if a person is going to game on-the-go then they would have a decent pair of headphones with them. Especially if they can afford to buy a gaming notebook! Since a person would buy a gaming notebook after a desktop and such.