Tube DAC, be gentle first time


I am thinking of adding a DAC to my system. I would like it to be a tube DAC since I have over the years been going back to an all tube system. I will be streaming from my Sonos to a Cary SLP98 feeding a CJ MV60SE. I need to keep the budget under $1000, and it would be better if closer to $500 for this first time purchase. I would like to buy used.
Questions:
Is this an upgrade or just a sideways move at this price range?

Any product recommendations, please be a specific as possible?

Thanks,
Doug
keep_lookingup
I also recommend the MHDT Havana, this is a very good dac and with the right tube can really sing. Another Dac that I could recommend is the Eastern Electric Minimax Dac for around $500.00 or the Plus for around $800.00. It has the ability to switch between SS and Tube depending on the sound you are going for.
There is a DAC 1 for sale now ($1000), but I am open to any suggestions. I am not in any hurry.
Doug