The Peachtree Dac*iTx would be inside your budget. It got excellent reviews. (Although you may have to get one second-hand, not sure if it's still in production) Schiit seems to have a lot of fans as well. I almost bought a Peachtree but found a vintage Keces 151 that has a linear power supply and sounds incredible playing needledrops.
I also use Audirvana in integer mode 1 and love it! Superb sound; truthful and clear.
I also use Audirvana in integer mode 1 and love it! Superb sound; truthful and clear.