Just some thoughts from a DoD perspective, I was (the project was politically cancelled) involved in the testing of the JCP (Joint Combat Pistol) that the US Army and SOCOM were testing for. The first round of tests included a variety of extreme conditions that i will let you conjure up in your mind and you will probably be pretty close to those tests. Several 1911 frame styles were submitted including STI and Colt, Glock and Springfield XD also were included. The 1911 framed pistols came back in bags! the Glock mechanically failed and malfunctioned in several areas, the winner was the XD ! the project never proceded beyond the first round.

as for my selections for you to look at, the STI double stacked .40cal, the HK45, and the new Sig220 tactical. All proven, and battle tested.

hope this helps, or adds fuel to a fire