Disklavier

We just got our DGA1 Disklavier delivered last night and we're extremely happy.  My only disappointment is that it has the DKC-55 (floppy only control unit) were I thought it had the CD drive (DCK-55CD). Unfortunately, I couldn't tell from the listing and I didn't even think to ask.  My plan is to eventually upgrade the box to the DKC-850, but is it worth getting my hands on a used DKC-55CD in the interim?  If so, how much should I expect to spend? Where would I even find one?  I'm I missing much by not having the CD drive?  Any advice would help. It will definitely be ahwile before he wife lets my spend any more money.
Thanks, Chuck