All 3 of them are overpriced as shit, but if you're dead on getting one of them then get the Asus one like Rusch said. Bigger hard drive and bigger RAM.
Also, as everyone has mentioned before, it's a big waste of money. Honestly I know it sounds great to have a portable gaming device but if you really want one then buy a ds or a psp. Computer gaming is not made for being portable and you're going to have one dick of a time with it.
Also, laptops aren't built to last longer than two years. Not without having to keep it plugged in 24/7.
Better off getting a pc and building it. A lot cheaper and a lot more stronger.