Acer Iconia W510
Like the form factor of the dockable tablet/notebooks, but don't like their prices? The Acer Iconia W510 might be an alternative, if you don't mind a slightly less beefy system featuring an Intel Atom processor and only 32GB to 64GB of SSD storage.
At 1.27 lb. (minus the dock), with a 10.1-in. 1366 x 768 display that supports ten-point touch and a vaunted nine hours of battery life -- up to 18 with the keyboard dock—it's clearly been built for road-trip longevity. Its larger cousin, the W700, bumps the display to 11.6-in. full HD.