I recently studied up on good BUG's that are more shootable that teensy chaotic pocket rockets like P3AT's. I found that the .32's are considered by many to be the best little guns which are teensy but controllable because of light recoil, but still offer okay power for the size. However, some have told me that the wallet holsters will give you more control with .380's, and at the same time make them very easy to conceal and draw.
In .380 PPK clones are generally regarded as pretty good, some being more reliable than others. Polish P64's are a 9x18 PPK, just small enough for pocket carry, often available for under 200 dollars. Bersa CC's are pretty good examples of this category as well. These are about as small as you can go with DA/SA unless you want to go for a .32 Beretta, and they are known for cracking at the frame after less than 100 rounds of standard ammo.
I've found a lot of people are really fond of Kahr's guns, being as they are long but smooth trigger pull mini Glocks. In terms of 380 DAO pocket guns, the P380 seems to be the king of the hill, but it's expensive. For a modest bit more size, the Kahr PM9 offers 9mm, which has about twice the knock down power.
The SAO Sig P238 and the Colt Mustang it was derived from are teensy and easy to shoot, but have to be carried unchambered or cocked and locked, which bothers some people when it comes to deep concealment guns. For rapid fire accuracy reasons I personally won't carry a gun in DAO unless it's a hammerless revolver (offers the ability to shoot through a pocket), so I consider these or a PPK sized gun the smallest choice in semi automatic handguns, but that's just me.
If trigger pull quality isn't an issue, Kel Tec's P11 and PF9 offer extremely compact and cheap 9mm firepower and even some with .40 conversions, at impossible to beat prices. Good guns, but they aren't good at target shooting, which in my opinion makes them far worse for protective use, but some people like them.
Taurus has a new teensy pocket .380 model which is available even more cheaply than the Ruger LCP, and supposedly has a nicer trigger. It comes with a carry case that makes it look like it's a phone or something. Even though it's made in the US because of the 68 GCA, they have been having a LOT of reliability issues, but some work. They are a solid option if you have a shop that will make sure you get a good one. Taurus also makes a scaled up model in 9mm, which has a DA/SA trigger instead of the .380's DAO.
The only way to go smaller than these things is to get a derringer, or go to 25 auto or .22lr with Baby Browning's or something similar, or perhaps one of the tiny revolvers like the NAA's. European's made a lot of .25's, and they have made some of the hottest ammo available, so I have read that in that caliber, you want euro ammo, otherwise with American ammo you wind up with low pressure ammo built for junk guns made of zinc. The mouse calibers will work if you do your part, and they have minimal recoil.
There are other .380 DAO's out there, but they don't seem to me to be very relevant, offering little if any advantage over the less expensive competition. Some other models in other calibers I didn't mention because others already did.
Rant mode off, I hope that helps.