Another option:
get one of these for $60.
get one of these for $60.
It is passive, dead silent, and compatible with balanced and unbalanced cables. It played very well with my Cherry mono amps that are Class D.
Then, put the rest of your budget into the best DAC you can find. Save some more here buy obtaining a preowned unit.
I have also had a Nuprime DAC-10 which is a preamp/dac and would recommend you take a look at one of these.

