Glock would be my choice also.
See the new James Bond movie? He is using his Whalter ppk I believe against the thugs who of course have Glocks with huge mags and double cylinder mags. He spent his and just looked at the gun like it was a waste of effort! Good fun.
Anywya, i love the thinness of a 1911, but is a bit more complicated for carry and I would not.
You could also look at the new single stack carry from SA xd and S& W I believe. They have great reviews and are not as thick as typical Glock