The .32acp is considered below the minimal caliber for self defense. .380acp is considered the minimal round for CCW and self defense, and it's basically just a little larger then the .32.
.32 is hard to find, There are dozens of different .380's out there right now thanks to the resurgence of CCW permits and a crop of new ultra small pistols to shoot them. Taurus TCP, S&W Bodyguard, Ruger LCP, Kel Tec P3AT, Walthers, ect ect ect. All good choices except for the one I chose the Taurus TCP. I got a very good one, never failed me in 500 rounds... But they have had issues compared to the others.
Also the new crop of 9mm's are almost as small like the Ruger LC9, if you can get that gun close to the LCP's price snatch it! 9mm is more powerful, MUCH more plentiful, MUCH cheaper, and available about everywhere. IF you shoot more then a few hundred rounds in the life of the pistol the 9mm will end up saving you money in ammo cost.
So, the Ruger LCP if your firm on one or the other. Ruger's are a very good brand even though I have not bought any as of yet. I'm one of the ones that have had good experience from Taurus and S&W, so I swear by both of those manufacturers.