Reason for no HK... The price including mags and aftermarket. But they've been considered and probably will be again one day.
Reason for no SA XD... I had an XDm 9mm and didn't love it. I love my XD45.
Reason for no SIG P-series... Good question, I should. I've always liked them. Pricey, but not too crazy for an all metal hammer gun.
Ive got 4.........all German, all stamped slide, all awesome!
But, and I've thought about it many times, if I had to grab just one, it would be my M92 over the P-series guns. The grip is a bit slimmer than the P226 and good mags are cheaper and more common, plus the trigger is better on my US built 92FS.
Still, its like choosing between a BMW and an Alpha Romeo (if they made a reliable Alpha, lol). The German guns are solid, purposeful, reliable, but they don't have the smooth, sexy appeal of the Italian.
Never had a real CZ, but I did have a Witness .45 and it was one of, if not THE, most accurate handgun Ive ever owned. It got stolen, otherwise I never would have parted with it.
M92, P226, CZ75- can't go wrong with any of these, they represent some of the pinnacles of handgun design. I'd highly recommend owning all 3, but if just one, get the one that speaks to your soul......