Used MF Trivista 21 or Benchmark Dac1?

No , I don't think they will. My 21 sounds a little brighter than my all transistor Audio Synthesis DAX. Not unpleasant, just more detailed. The 21 is still a top decoder and very well built. It has the potential to be modified into an even higher performing component ; there are companies here and in England doing this. I will probably get it done someday but it is great as it is. I would always go for used as you are getting a better product for the same money.

I just asked myself the same question, and ended up getting the Trivista 21. Part of my thinking is that it seems more likely to hold its value IMO. MF has a good rep over a long period of time, and Benchmark seems to be more of a "flavor of the year". The Benchmarks are getting dumped in large numbers here, probably because some want it with the USB output.

First impressions of the Trivista 21. Built like a tank with exceptional fit and finish. Sounds much better than modded Sony NS500DVD Universal player w/o the dac(as you'd expect!). On my rig 192k sampling sounds much better than 96k, and this contradicts other comments that I've read here. For my ears(& some friends), 96k sounds a bit hotter than should be in the treble, while 192k sounds more naturally balanced while giving up a tad of high freq energy. The tubes don't give it a very tubey sound, like you might associate w/older tube power amps,etc, so it's hard to say if that will tone down the Krells, but overall the sound is pretty smooth, so I think it'd be fine. Probably so would the Benchmark or the BelCanto.
FWIW, Using a Sterevox XV2 dig cable here, based on widespread recommendations, couple w/my lack of dig cable experience.
Sorry to sound inconclusive, but I haven't compared side-to-side, and don't want to give you any definitive proclamation. Cheers,
Spencer

Thanks for the feedback - I'm a sucker for the heavy, substantial seeming pieces, so I may go with the TriVista. So many choices...