$600 more =
Four-Finger Touch, 45-nm Cooler CPU, 9400M GPU, Faster System Bus, Faster DDR3 RAM, SATA hard drive....which also is a larger hard drive at that......
then the intangibles, no core shut downs, no overheating, more comfortable on the lap, and the ability to play videos without stutter....
you'd be raping your wallet if you bought that over the Rev. B.