These kinds of threads are tough, because finding the right carry piece has more to do with YOU than what we (INGOers) think.
Looking around and making the decision is half the fun (and educational). Enjoy the process.
M&P is pretty pimp but save money get a glock 23.....
Seriously go feel some guns see if you can borrow one to shoot from someone. The gun that screams THIS IS THE ONE when you hold it should win.