As far as these computers, I own and use a Sager NP7338 (Clevo W230SS) that I purchased through XoticPC. Works perfectly great with Linux and Sager has been pretty easy for me to contact directly and get replacement parts (a keyboard so far.) Mechanical quality is only fair. Had some problems with the hinges, which I ended up drilling out and putting in some bolts, but other than that I've been extremely happy. I've three SSDs in a 13" computer with replaceable batteries, so I've gotten plenty of good use.
Intel WiFi is in a lower tier of support, where you can't count on having access to the full capabilities of the hardware (eg. apparently power management hasn't been working for quite some time, and AP mode is only available on 2.4GHz). But at least Intel WiFi drivers are open-source, so it's clearly a better choice than Broadcom.
http://www.anandtech.com/show/10795/the-clevo-p870dm2-mythlo...
Clevo is the OEM that builds the laptops for System76, so the review should be fairly accurate.