Would this be an upgrade?

Hi- I've been using a Theta Miles cd player which is the balanced version and like it alot. But, I have a Sony 9000es dvd player and was wondering if I add a dac to that would it sound better? The dacs that I was interested in are the Theta Basic IIIa and the Classe DAC-1.
Please let me know if anyone has any ideas or feedback on this.

Thanks Jim