Tube DAC Recommendations


I am in the market for DAC; my preference is a tube DAC. My primary music source will come from a computer or music server. The DAC will connect to Sim Audio 700i integrated amp. Budget is up to $7000 for the DAC.
I have been studying this forum over the last several months but cannot seem to find a consensus on the top 3-5 tube DACs.
Any input is appreciated.

Thanks
ddelisle911
I have the Ayon CD5S which is IMHO one of better tube DACs in the market.

But I've been listening to a Lenehan Audio PDX Level 2 and I think that thing might have a lead on the Ayon. You don't pay for fancy metalwork (though it does look decent) but what you do get is the PCM1704UK (highest grade they could source) and a great tube output stage.
I doubt you will find a 'consensus' here, either. I have a new Aesthetix Romulus CDP, which is quite impressive. The DAC-only version is the Pandora. Mine is still breaking in fully, but the sonics are very nice. Superb tonality of instruments, excellent imaging, and very pleasing to listen to. Also top build quality from Aesthetix.
To all-
Thank you for your responses; I welcome more. In the meantime, I will start my research on the above that were already mentioned, I now have a starting point and this helps a lot.
here is another opinion:

first, i have been attending ces exhibitions for fifteen years. i have also attended many shows in nyc. from those listening experiences, i would try to find the original zanden dac, not the current version.