Very personal decision. All the guns you mention have their champions, as well as detractors. I have a P90 and it is the most accurate .45 I have ever owned. But, I have never owned a Kimber. There are many folks that swear by them, and they sure are a handsome gun. I, personally, never cared for Glocks. I know, they are great guns, but they are just not my thing. The Sig is supposed to be an outstanding weapon as well. So, I know I have not helped you much, but like I said, this is a very personal decision. I guess the best thing you could do is to handle each of said guns and pick the one that just feels right to you. Honestly, the 1911 feels better to me than my P90, but I have never owned a 1911 that would reliably feed HPs. Never. Everyone I ever owned would jam with HPs.