Good looking HK shame on the caliber but cant win them all. I agree with the above posts you could get $500 for it easily maybe more depending on if you have the box and such.
The USP .40 I had I paid $650 for in used, LNIB condition. When I sold it, I got my money back out of it. It was nice, but did not live up to the hype. I will say that the HK USP .45 is without a doubt the most accurate .45 I personally have shot, and I figured that the .40 would be as good. Not so much, IMO.