best DAC for PC server

I have recently started using a PC to serve my red book CDs to my music system and I love the convenience this system gives me.
What I hate is the sound quality - output of a RME9632 via glass optical to EAD8800pro DAC pre-pro. Its not bad, its just rather average and misses capturing the emotion that Ive heard through the best cdp's (Linn CD12 for eg).
I now want this convenience but with great sound quality of the CD12.
Would adding a Meitner or DCS (and so on) quality DAC on to my PC be worthwhile?
Can the Meitner take a coaxial input and how does it sound when not fed via the Meitner transport. I am aware I couldnt use SACD but this is a insignificant problem right now. I would have the ability to add a transport later if SACD became interesting to me.

thanks in adv,
VB