IMO you're wasting your money, if you also continue to use the Link DAC. The Rotel will only be a transport in that setup and it's internal DAC will not really matter. There is nothing special about the transport mechanism in the Rotel 991. It was the RCD-990 that had the great transport. What can be said about the Rotel is it plays HDCD, but so will the Link DAC if you get the HDCD board. The Rotel 991 is a nice stand alone player for the money.
Actually the Dynaco is only a transport in your setup also.
Believe it or not, the best transport for a Link DAC is a $100 Aiwa XC-35M or XC-37M Five Disc CD Changer. It can be modified and made even better by Stan Warren for another $150.