A good one is the LC9 Ruger. Mrs. Big John has one and it's a decent size and still a 9mm.
If you want to get smaller and don't mind going to a smaller caliber, the Ruger LCP .380 is a solid piece too. I'll carry mine with a pocket holster right in my front pocket.
I like revolvers because you can't beat the simplicity of "pull the trigger". I carry a Taurus magnesium 856 .38 special snubby. The Taurus has 6 shots.