What’s the best DAC match for the Cambridge Audio CXC original or V2?

To DACs mentioned that would 'smooth out' the brightness while maintaining, likely improving,  resolution are the Orchid and the AM Tubadour. Both great DACs for the money. I own the AM. 

I use a Lifatec toslink cable between my DVD player and DAC. I think it is great and not overly costly. 

Also have glass toslink made by a company call GLASS. It was recommended by someone on this site. I bought it off ebay. Even less costly. The cost made it easy to 'buy to try'.

That said I would use the coax output over toslink if possible, 1.5 meter (as jjss49 stated).

Much has been discussed on this forum regarding coax vs. optical connection with the majority finding coax preferable.  There are also discussions on the science regarding length of coax cable, with  very short or 1.5 meter being optimal for most cables. Neither issue is likely true under all circumstances. I chose to go with the consensus on this one and have been happy. I run both so as to connect two sources to the same DAC having only one of each type input. The primary source gets the coax cable. And, as jjss49 indicated the coax is more durable. With glass optimal do not use tight bends in the cable.