.357 magnum 7 or 8 shot, S&W, but with a handle more like their early 20th century .38 special Navy revolver, which sits in my hand much better than their current handle, and a 7" barrel.
Sig 226 chambered in .357, but with about an inch more barrel length, and a higher capacity magazine.
Walther P99.
And I'll put in a couple of long guns while I'm at it.
Swedish mauser m96, scoped
Browning semiautomatic shotgun
Fully-auto AK-47 (since we're fantasizing, legally owned of course)
Military version M-16