I carry a USP45 Elite. Concealed. In the summer. In Miami. Your argument is invalid.I see I am late to the party.
You already have a P7! That is awesome. I'll throw in my 2 cents, as I also have XL hands (XXL depending on the gloves).
The USP .40 was my first HK 20+ years ago. I REALLY wanted a P7, but the USP was the same price NEW, as a used P7. I don't regret the USP at all, it is BY far the most natural feeling handgun I have for my big hands. I wish I had gone for the .45 USP though, as the muzzle flip on the .40 is pronounced, and I understand the .45 is much more stable, but adds some kick directly backwards into your hand, which I could live with.
You list 3 uses for a new HK handgun. Target, nightstand and carry. lol. Pick any 2. :) The USP .45 would make a TERRIFIC nightstand and range gun. My .40 sports a Viridian X5L green laser with light and THAT is a nightstands dream setup. Great shooter for my backyard range too. Almost as accurate as the P7 to me.
But if you are going to carry, I wouldn't recommend a full frame USP. It is just TOO big, even in the winter.
The setup I have fallen in love with is the P7M8 for summer carry. The single stack mag and uber grippy Nils grips are stealthy and draw FAST. For the winter, I switch to a VP9 to carry. The sights are darn near identical, and the weight is too. Both are striker fired so no hammer to concern yourself with on draw. Common 9mm ammo for both keeps your inventory easy. And the VP9 carries the tiny Crimson Trace green laser perfectly (after a little modification to it) where my index finger lands PERFECTLY on the lasers paddle switch, on draw. When I take it off at night, I put it on the nightstand and the USP stays in the safe until summer when the USP and VP9 trade places on the night stand.
I don't want to talk you out of a USP. It is a GREAT gun. But with a P7M8 and a VP9, it has become somewhat redundant for anything but range practice, and as a heavier hitting nightstand guardian.