No experience here, but I've read about the Rega DAC, and using the Apollo as a transport, that fellow's opinion was that it surpassed the performance of the Apollo and Saturn players.
A big plus is that you can audition the Rega DAC, and if you don't like what it adds to your system, you can return it. So this is risk free minus shipping. I also read that the Rega DAC has the Rega house sound. And all this for less than the cost of a Saturn. Trying the DAC with your Apollo seems like a slam dunk to me. Whatever you do, good luck, and let us know of your experiences.
A big plus is that you can audition the Rega DAC, and if you don't like what it adds to your system, you can return it. So this is risk free minus shipping. I also read that the Rega DAC has the Rega house sound. And all this for less than the cost of a Saturn. Trying the DAC with your Apollo seems like a slam dunk to me. Whatever you do, good luck, and let us know of your experiences.