I really love the Colt Mustang in .380. It's too bad they're no longer in production. I have been looking for a nice use one for myself, and they still are fetching around $700. or better.
I agree with all the other members that, it (.380) will get the job done. Carry what feels comfortable to you, can something you can easily conceal everyday. I also agree with bigger is better, but control and shot placement is most important!~ IMO