IMO you're asking for a handgun to cover both plinking and concealment. That's a tough role to fill. A pocket pistol like the LCP or my Taurus TCP are easily concealable but make for lousy plinkers because they are used in extremely short range situations. What I like to call "get out of trouble" weapons. Because you want to stay with the 9mm, if I were in your shoes I would look into the Smith & Wesson M&P compact or similarly sized pistols to find the one that fits you best. These are fairly easy to carry concealed and are decent plinkers at moderate ranges. And the reason I mentioned the M&P line is that they also make a .22 LR version with the same feel as the larger calibers. So you can use the .22 for plinking and the 9mm for carry.