1911 in any frame size or caliber, but .45ACP is my knockdown dragout favorite. I have 3 right now, but am considering another. As soon as April 8 rolls around (effective date under passage of HB12 in Ohio) and my CCW paperwork is taken care of, I'll be carrying my C6.45 LDA.
I have a Bulgarian Mak also. It's a fun gun to shoot, and the price was impossible to pass up. $150 for unfired pistol, 6 mags, holster, and cleaning kit. That was 4 years ago, but they're still close to that price. They usually don't come with as many magazines now, but still a good deal.
Other pistols... I like the Colt 1903 in .32 The sights absolutely blow, but they're accurate. The ads from the early 1900's tout it as a snag-free pocket pistol for a gentleman's personal protection. There isn't a sharp edge or corner anywhere, so they weren't kidding.
One of dad's buddies has a .454 Casull and .480 Ruger. You need to shoot both of those guns at least once in your life. They are MONSTERS!