If I were still a police officer, I would carry a 357 Sig forever. Flat shooting and accurate. I was put onto the caliber by a former fellow officer. He had a M&Pc. I found a NIB M&P FS with nite sites in February for $419 plus tax FROM A DEALER at the Frisco gun show. Reload to reduce flash. Midway has dies (9mm for body sizing, 357 Sig dies for neck and shoulder, Factory Crimp die for finishing in my progressive- no lube needed.), Starline has brass. 9mm bullets are around (Don't use Golden Saber, plated, or lead). Use Ramshot Silhouette powder. Silhouette powder gives velocity (1350 fps w/125 gr Speer hp). No pressure signs and almost zero flash signature indoors. I got a 40 S&W barrel from midway for $93 and a 17lb ISMI recoil spring. Comfortable to shoot.
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Boxers or briefs? At my age, Depends.