Digital front ends although very similar in design, are as different sounding as analog. A Mark Levinson dac compared to Musical Fidelity, Chord, Krell, MBL, DCS all sound different from one another. The same sound differences are found in transports, interconnects, amps, pre-amps et.al. It is IMO very important to try as many component combinations as humanly possible, because some components just don't sound well together. I've heard systems that were well in excess of $ 100,000.00 that I personally could not listen to for any length of time. Everytime I am ready to upgrade something in my system, for several days I would only listen to several of my favorite CDs. Once the change was completed, I would relisten to the same CDs, which will allow you to easily pick out the perceived differences and if the differences are to your liking. I personally really like Mark Levinson dacs, I like MBL dacs better, although both are laid back, throw deep soundstages, very musical, revealing, but sound different from one another. To build a system that translates your listening preferences can only be built over time and through trial and error. Just my opinion.
My System:
Krell Amp and Pre
CEC Transport
Mark Levinson Dac
DCS Purcell Upsampler
Piega & Rel speakers
Hydra 8 AC cond.
Marigo Apparition- AC
Shunyata Power Cords
IC- Jena Labs & Purist Audio
Digital Cables- Goldmund Lineal 75 Ohm
Speaker Cable- MIT-MH-750 Magnum