Xerox 6085 and Intel MDS II - Value?

Hi all, I'm in need of a new cabin and might be willing to part with a couple of my more unusual systems to fund it. I have a complete Xerox 6085 with monitor, keyboard, mouse, and tape drive in very good visual condition, with only a few scuffs on the case and some minor yellowing on the keyboard and mouse. The card slots are fully populated, but I haven't check how much RAM is installed yet. It has a working hard drive but no OS. It boots up and IIRC passes the self test. I don't have a floppy drive for it but could wire one up to further test if anyone has a diagram. I also have two Intel MDS IIs, the one I'm thinking of selling currently lights up but doesn't display anything on the monitor. I also have various boxed ICE devices (8085/6/8), software (haven't tried reading it, some of which isn't on bitsavers yet), and manuals for everything. Has anyone seen these sell in the past? All I could find was an ebay listing for a badly damaged Xerox base unit for $500. I live in England, but would be willing to ship worldwide. Regards, -Tom