Agree, you can get close to your money on Audiogon. If you really like the Denon 103, you might not want pay for the Zu modf.
There may be a marginal difference but not night and day plus you still have a 50 + year old conical design. Since this started
out as a Red Ed thread there is obviously a lack of proportion viz the 103 before the Zu modf. even enters the picture. If you
decide to sell your Shelter 201, you can pick up a Denon DL110 at Comet Supply for $90 plus $8 shipping if you don't mind
the up to 6 week wait and you will find the 110 is a much better quality unit, sound wise, more approaching the 103 in quality.
If you break any more styli, do make it the Red Ed though! (ha)