Hi Jim,
The CP comes with a basic remote. The $150 upgrade is larger digital readout remote.
The Sanders is comparable to a Coda 04/Windows Continuum III, it was from around 2004 or so, the CP replaced the CL with added phono, I believe the CP came out in 2012 or 2013.
The Muse is very discontinued, I'm thinking 2001. It is a really nice sounding pre. I spoke to Kevin Halverson (designer) at one time about this, I believe around 2009, at that time he compared it to the current models Jeff Rowland models. I liked this pre, but by the time you add a phono, you might as well get the Coda, I didn't realize that Bill D was the person selling the CP, you will most likely get a full warranty with that. I looked a bit around Agon for you and came across a CJ Premier 18LS... This is also a nice sounding pre.... Well, I think this is all i've got for you, Good Luck, Your looking at all nice pieces.