Glock 19 all the way. You'll want one eventually.
For some reason, people I know personally move up to the G19 from the 26 or 27 but never move down to the 26 or 27 from the 19.
Buy once, buy right. Glock 19.
This is truth. Everyone I know who bought a 26, now has a 19, and rarely uses the 26. I bought the 19, and have absolutely no interest in a 26.
As I said, if you can conceal a 26, a 19 isn't that much harder to conceal, plus you get all the benefits of a near full size pistol.