Definitely pricey and a little off the beaten track but I absolutely love my Chromebook Pixel LS. Ubuntu was super easy to set up using Crouton. Everything worked out of the box, the only minor modification I made was replace the synaptic touchpad drivers with a ported version of Chromebook's. When I'm not developing I usually keep it in ChromeOS as it is extremely snappy and responsive. A quick keypress and I can drop into Ubuntu to get some work done.