I think alienware just refreshed their 13 inch. Now it has quad core skylake 6700hq, 32gb ram, nvidia 1060 6gb, fast ssd, and a 1080p display option in case you will mostly use it docked. It also has a proprietary external gpu plug that seems redundant for a mac user where a 6gb 1060 performs better than any graphics card in any mac ever. I never even considered getting a 13" because they are usually dual core but this looks like a great machine for an engineer who mostly keeps it docked.