$999

Adjustable performance, excellent battery life, two-year warranty, removable battery, USB 3.0 support

Big and heavy compared to other ultraslims, screen blanks out when switching modes

Asus has another surprise up its digital sleeve: a two-year warranty on the system, whereas the others cover their machines for half as long. The company doesn't offer a three-year warranty, but if you get the system through Amazon.com and choose the extension, you can get a third year of coverage for $120. Asus also provides one-year accidental damage protection, something the others don't.