I am sold on the deh-p800prs so far, very nice head unit! It does not come with a usb jack but allows you to add the cd-ub100 which allows you to use usb sticks and media devices. The 980 and 9800 dont say they support the add-on. Best difference I can tell is Premier offers a 2 year warranty over the regular Pioneer 1 year warranty and in the past i know the Premier line would have gold plated rca jacks but that really is a non issue.