The Walther P22 has the perfect dimensions for CCW IMO. It's only 6 inches long total, 4.5 inches tall, and .9 inches wide. But it still looks like a full size gun, just shrunk. Guns like the XD subcompact, and even the Walther P99Compact look kinda goofy to me. The grip is really short and stubby and the frame looks over-sized. I know, I know, looks aren't really at the top of the list when you're picking a tool to defend your life. But if I can, I would like to find a pistol that is the same proportions as a full size, just smaller. The closest I can see so far is the Kahr P9. But that is DAO. The Taurus Millennium Pro looks pretty sweet. It's 6 1/8 inches long, 5.125 inches high, and 1.125 inches wide. And it's DA/SA.
A Walther P22, but in a real PD caliber, with a steel slide, would be beyond amazing.