Thanks for the replies everyone. While I am not unhappy with the sound coming from my Marantz CD 6007 I can't help but to admire the build quality of the KI Ruby and the Denon. I would think there would be a big improvement in sound as well. I am a cost conscious shopper and have been looking at the used market as well as b-stock/refurbished.
Marantz SA-KI Ruby vs Denon DCS-A110 Anniversary Edition
I am thinking of upgrading from a Marantz CD 6007. Does anyone have experience comparing these two?