Sony SACD Owners: Anyone Use a DAC for Redbook?

I recently purchased an XA-777ES, and although the redbook play is "nice", I feel the unit would be unbelievable with a decent DAC added. I got a bit spoiled with my old Cary 306. The Sony performs well, but the Cary was added "sweet air" to many recordings.
My dealer told me that the addition of a DAC to the Sony SCD-1 and 777 models was a fairly common practice.
I'd be very curious to hear opinions of those DAC-ing the Sonys.

Thanks,
CB