I have a 350 MHz 4000X-series up for sale, great condition, unfortunately no front cover, no probes worth mentioning (I think they are the standard 200-350 MHz ones that come with the edu scope series). This one has touch screen and 2-Ch signal generator. Can do the frequency response analysis.
Pretty sure the 350 MHz version needs just the license to become a 500 MHz scope.
thinking 3999€ (shipping included)