Buy this, here's why, I own it: Taurus PT111 Non-PRO. Despite what anyone sais, I've owned several Taurus and haven't had one single problem with any of them. They carry a lifetime warranty that follows the firearm. The Non-PRO model was a DAO, 10+1 double stack that is roughly the same size as a Glock 26/27. They use a striker fire system that is plenty safe enough to carry with the manual safety disengaged. Mine has eaten everything I've fed it without a hickup, from dirt cheap Wolf FMJ to Hornady CD. I've got just under 500 rounds through mine so far, which I purchased used for $199 by the way, so total round count is unknown. It holds a 6 inch group just 1 inch under POA at 15 yds, which is plenty accurate for SD. The DA trigger pull is a little heavy at 12 pounds, but after a few thousand dry fires my finger doesn't know the difference any more.
Buy this, here's why: Kel-Tec PF9. It's an ultra slim, ultra reliable 7+1 single stack that I had the pleasure of shooting when I was taking my CCW class. It was the instructors personal backup gun, which resided full time in his strong side pocket just under his holstered Glock 17. I'm inclined to believe his trust in the firearm, as he is a licensed bail bondsmen in the TC Metro and does 3-4 bounties per week. Not the type of job you trust to just anything.
Buy this, here's why: Glock 17. As mentioned above, when something is trusted almost universally for it's ability to perform the job at hand, it isn't for nothing. Even if it is as ugly as the love child of Pit Bull and a Chihuahua.