Dell XPS 18
You needn't feel torn between a desk-bound all-in-one PC and a mobile tablet. Dell's XPS 18 delivers the best of both worlds.
This machine has an 18-inch touchscreen display and runs a full version of Windows 8. You can work with it parked in its desktop cradle, or you can detach it and use it as an oversize tablet. In our tests, its battery lasted for more than 4 hours.