Disklavier

I'm a new member.  I spent several enjoyable hours last night 
reading though the archives.  The pricing database was also very 
educational.

I am in search of a Disklavier, preferably Mark II and newer.  Would 
appreciate any pointers to individuals, dealers and RPTs familiar 
this line of pianos in the Northern California area.  Would be 
willing to travel for the right piano.

Ideally, I'd like a DC3A but that will be on the high on of my 
budget.  I was wondering if getting an upright is a good idea, to 
get a feel for the Disklavier system.

Some questions:

  - what's the difference between the DC3 and DC3A?

  - what's the difference between the MPX1Z and the older MPX1?

Any advice would be much appreciated.

Paul