Dell actually has a line of laptops that ship with Linux [1]. You don't get a choice of distro (they ship with the latest Ubuntu LTS), but the fact that it ships with Linux out of the box means that the hardware has all been pre-verified for Linux compatibility, and installing a new distro should be a matter putting in the install media and grabbing a cup of coffee.
Dell actually has a line of laptops that ship with Linux [1]. You don't get a choice of distro (they ship with the latest Ubuntu LTS), but the fact that it ships with Linux out of the box means that the hardware has all been pre-verified for Linux compatibility, and installing a new distro should be a matter putting in the install media and grabbing a cup of coffee.
[1] http://www.dell.com/us/business/p/xps-13-linux/pd