Any service caliber with JHP's designed for the law enforcement market is going to offer substantially identical performance: ~12" of penetration and >.6" recovered diameter, with good weight retention even after defeating barriers.
Pick the caliber name you think sounds the coolest, and then get it chambered in the gun that will most impress your friends. You can tell a pistol is good if a lot of people have it mentioned in their signature lines on this board, or have tattoos of the manufacturer's logo. Also, do a thread search here to see which ones have been mentioned most often in threads entitled "_______ RULEZ!"
You're welcome.
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