[ajford]

I highly recommend a decently modern Lenovo Thinkpad.

The T470 and T470s/p are pretty nice. I managed to get a good bargin on a T460 off Craigslist, and it runs like a dream. After some minute tweaks (mostly installing tlp), it's running Ubuntu 17.10 fantastically.

If you want something a bit smaller, the X series is the line with a 12.5inch screen. Downside is the latest model (the X270) only has a FHD screen, with 1920x1080 max. The T470s and T470p both have a 14 inch WQHD screen with 2560x1440 max. The 15 inch T570 has a UHD screen with 3840x2160 max, which is definitely Retina-like.