Great system. I have and love that Rotel CD player. 2 suggestions.
1. Streamer. Check out Innuos. They have several models depending on your budget. I have the Zen MK3 and it improved the sound of my system.
2. Holo Audio May DAC. Comes in different builds again depending on your budget and preferences.
The combo of Innuos and Holo Audio is an excellent match in my experience and made significant improvement my system.