You'll get differing opinions but since you have a tube pre amp if you like the sound you have now a tube dac will add coloration to it. I would try both one or so with tubes and without.
Get a nice clean, crisp, transparent, neutral, musical DAC... Have you done any tube rolling with your C500 Pre or ZH270 Amp? You have a lot of tubed sugar going on there... You need to demo some DACs in your system to know what sounds good to your ears/brain... I love the sound of tubes although in my system I chose a non-tubed DAC... Good luck in your search...
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