I purchased a Sig Sauer p320 in .40 last spring and that thing drives tacks at 20yds. The P320 is a modular platform as well so you can change calibers relatively cheap if you choose to do so. I think they offer it in .380, .357 SIG, .40 and .45 Not overly pricey either.
"A free people ought not only be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government."† -- George Washington