I also am considering this gun but in 45. There was a full size USP at the Hampton Gun show for $828 NIB! I should have bought it. I have seen them online between $850 and $1050 but then you also have to pay shipping etc.
I have held a couple and plan to shoot a friends USP next month. The grip is large enough for my hands. I have also considered the expert version of the gun with the longer barrel and locking o-ring but that increases the price a couple hundred too.
The only two things I have heard people complain about is the mag release button is pushed down rather than in and the front rail is proprietary rather than picatinny. The HK45 has the picatinny rail but only has 10 in the magazine whereas the USP has 12 of 45 (13 of 40) in the magazine.
I don't think you can go wrong with it. I also like Sig Sauer (which I own a few) and am considering a 1911 also. Others like the XDM but the grip safety still bothers me.