9mm - Stainless CZ75, would love to give one to the gf
.40S&W - well, I don't shoot .40S&W, I shoot .40Manly so I guess I'd do another Glock 20
.45 - well, I'm not sure. Ten years ago I would have said, "another Series 70". But these days, I don't know, maybe STI makes one that I would want - say bare bones but with trigger job, night sights and what we used to call "throating" - to be honest I don't even know what was being done there, I think the chambers were being polished at the breech end to feed HPs more smoothly.
I also hear good things about the Springfield Pro Operators but I have never used one.
Anyway a good simple combat 1911 with night sights and a good crisp trigger would be my choice.