I'm in the same market, have shot several and have yet to find one I like better than my Colt .380. A close runner up was the Bersa Ultra Compact 9mm, was the best balance of weight and size/accuracy of those I tried. I really want to try a Beretta Nano, have heard good things about them but none are available locally for trial and don't know anyone who owns one to check out.
I've found some good 9mm pistols, foremost the Ruger 89 and Beretta 92FS, but these are full sized frames with long barrels. They are not ideal for concealed carry, but very accurate with very minimal recoil compared to the sub-compacts.
I tried the Kel Tec PF-9 and PF-11, too light for anyone less than an experienced marksman to control well. First rounds were all very accurate, but went downhill from there. I couldn't rapid fire either one well at all, but then again, I will be the first to admit I'm not a trained marksman, probably why I still carry a .380. It is the largest caliber I can shoot consistently and well.