i can't imagine the prices are going to be that different, $400 sounds like alot. i'm thinking it must be something as far as features or condition that makes the prices that far apart. i would suggest looking into those prices some more to see exactly what you are getting. budsgunshop.com has the USP 45 for $725 and the USPc 45 for 757. i have the USPc 45. it's a great gun, but i don't think you'll be dissapointed in the full sized USP either. unless you are looking to carry concealed, the USP might be a better choice with the full sized grips.