XPS machines look nice, but I'd recommend the Dell Latitude line for those who plan to potentially use Linux. The compatibility is just on a different level, and they are pretty nice work horses hardware wise.

Latitudes lack that infinity display, sure, but at least I'm almost always using an external monitor anyway. Some of the other features are more subjective, but I also like the matte screen, better keyboard, camera on lid upper edge, support for a docking station, and so on.