Disklavier

I strongly considering buying this piano knowing that it has 
the "older" mark II system in it.  (6'2" - NP98 - asking $24500 "new" 
from Yamaha dealer).  
The problem I am really having researching this model is that 
information on it is not available on the Yamaha website.  I know it 
does not have the silent system and the piano smart/smart key (not 
interested in these features anyway).
Features that I do want - midi capability to record to cakewalk etc..
(i believe it does this).  I guess what I am trying to figure out is 
that has there been any SIGNIFIGANT upgrades aside from the control 
unit that I should be aware of - abviously the dealer is not 
forthcoming if there is.  He claims that the optics, soleniods and 
machanics are exactly the same as well as the basic unit except for 
the integration of the CDrom and the features list above.  True 
statements?  I don't know.  
The question - should I get this piano OR get the DGH1BA (a 5'3" has 
the Mark III system 19,800).  
Help Help Help.
Thanks.