I agree with hmphargh that Kahr PM45 is a good choice. I have a Glock 30 SF (45 acp) that is 10+1.
The S&W M&P45C also caught my attention because it has a manual safety.
I've researched this whole pocket rocket thing at length for a good, compact .45 and ended up with my G30 SF.
If you compare barrel length to gun length/gun size ratio, Glocks provide the longest barrels given the guns dimensions which is good for .45 acp because some people will criticize that .45 acp only belongs in a 5'' barrel--1911 lovers...