I bought a Sony MDS-JE470 from ebay, cost GBP 40. It does NOT have digital out HOWEVER it is possible to mod the unit to give optical out. Basically drill a couple holes and solder a suitable optical transmitter into the main pcb. Worked a charm for me, I successfully transferred a MD. If you decide to go this route, I can supply better instructions and photos if required. (and if you choose a different deck, do please check online first to see if it is possible to mod!)
best regards,
stephen