Wow, that's like asking what kind of car should I buy. I would think of your needs, and then rank them according to importance and start from there. Caliber will dictate size to some extent. But having carried for 15 years, the bottom line is "carryability" really starts to become the biggest issue. If I could reasonably carry a S&W Recon .45, I would, but the damn thing is just too big. I've carried a Sig P239 alot in coat weather, but that's too big for Summer. If you're OK with a .380, I like the Sig P232, and the new Kahr .380, but the latter is impossible to find right now. Finally, the one piece I do carry alot is the Rohrbaugh R9S. WARNING: These are pricey, tough to get, and kick like an angry mule. However, if you want a 13oz, 7 shot DAO 9mm, that is about 3/4" thick, and 3.7 x 5", that would be THE PISTOL!