Glock 26 for the reasons mentioned above. I have the same size G27 and it's great for CCW, easier than my G23 which is the same size as the G19.
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek