I have Glock 17, 17L, and 31. For some reason I have it stuck in my head that I want a Glock 37. Common sense tells me to stay with a popular caliber--9mm, 40, or 45 acp. But my favorite caliber in the 357 SIG so what do I know? Does anyone have either a good reason to do it or to stay away and say go to the 45 acp? Any feedback is appreciated.