wpsdlrg good points. I had not even really considered trigger style and feel. Those are excellent points. I can certainly see, in my particular case, the Glock 9mm and .45 platforms becoming my semi autos of choice for self defense.
I will likely always keep my M9 and 1911s, but presently they are not my "go to" firearms.
I have considered moving to one caliber, but I am not ready to focus solely on either the .45 or 9mm yet. Eventually narrowing down to one cartridge type may occur. I certainly see the utility in so doing.
Ruger SR1911, Colt 1911, Glock 17, Glock 21, Beretta M9, Ruger GP100, Ruger LCR, SW M&P15, Lee Enfield 303, Savage .22, Ruger 10/22. Guns the great equalizer.