I had a modded out Denon 5910ci for a while and I liked it very much for red book CD. That said, it really didn't sound any better than the Oppo I now have which goes through a Bel Canto DAC3. So I agree that the DAC makes the biggest difference. Well in my system it has.
Since you have a great turntable, don't bother with the digital files anymore, I don't.
Since you have a great turntable, don't bother with the digital files anymore, I don't.