I know that it is a stretch but the MSB discrete dac is pretty incredible in regards to resolution and tonal accuracy as well as people like to say prat. I moved from the Bartok to the discrete and was happy with the change. I did buy the bartok when they were still $12k so it made it easier to swallow than where they are now at $20k new.
I did recently upgrade to the MSB premier and am extremely happy it adds to the discrete in all aspects but is way out of the price range you are looking in. That said you can find a used discrete around $9k right now. Or look at Metrum Acoustics the onyx is really good.