New DAC advise

Hi All

Hope you are doing well?

Looking for a new Dac to feed my musical fidelity m6i, that goes to Bentley FS150.  Currently using SMSL Sanskrit 10th Mk 2

Looking for a balanced DAC to feed Amp, and source will by Pi4, so DAC has to do USB input.

Options that i am currently looking at (Budget below 8k). 

iFi Zen One Signature
SMSL SU8/9n range
Schitt Modius.

Any other ideas, or deals maybe that i am missing?

Thank you.