Disklavier

Hi folks,

First, I'd like to personaly thank Mark Fontana for leading me to 
this message board.

I'm getting ready to purchase a DC2M4 or a DGC1M4.  First off, what 
is the main difference between these two besides the size?  I'm 
having troubles finding if one is built better then the other.

Also, can anyone offer any suggestions on how you negotiate on a 
piano?  My dealer here is offering the following "truckload" special 
pricing including Yamaha discounts.  I've purchased the Piano Book as 
a price reference and I'm thinking these prices are still too high.  

DGC1M4 Retail $39,995 Special Price $31,799
DC2M4  Retail $50,495 Special Price $38,846

I have called a few other deals out of town, but their prices are 
higher.  Any input you can offer would be greatly appreciated!

Thanks for your time,
  Brian