Well. First off, Welcome out of the Shadows and into the FTF Community. The guys and gals usually like new members to stop by the Introduction section and introduce themselves. I will leave that decision up to you.
As for your short list, you have done EXTREMELY well in your research. Both the CZ-75 and the HK USP are excellent weapons. I had a USP Tactical USP for a couple of years and it's a very well made piece of kit. The CZ-75 is one hell of a well engineered weapon and having shot them, I can say without a doubt that I would have no problem recommending them to family or friends.
The Glock? Eh, not for me, but they go bang every time you pull the trigger, which is important in a carry piece.
Have you shot any of these choices yet? I would encourage you to do so before you slap down any hard earned cash because they ALL have different grip angles, different safeties and different designs. You really need to see what fits YOUR hand the best.
As you are already a 1911 owner, I would strongly suggest the CZ be shot LAST. It's the closest to what you have now, so don't taint your new buying experience with testing it first. You need to try the other two first.
Trust me on this. Find a good range that rents guns and spend some money for a range day.
Once you shoot all three, the decision will provide itself.