From the land of ice hockey, frozen wine, and decent beer, come Two DACs manufactured by a small company in Canada called exaSound, run by a smart guy named George Klissarov. Both support PCM up to 32/384 and DSD up to DSD256 over USB. The e20 mkIII will run you $2499 and the e22 will run you $3499. exaSound also sells an 8-channel DAC called the e28, for $3849. See here for a spec comparison chart.
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"exaSound Audio Design has managed to carve out a conspicuous place in the high end audiophile DAC market since beginning business less than 4 years ago..."
"The first sound characteristic of the e22 that grabbed my attention was the enormous soundstage that this DAC is capable of rendering."
"The e22 struck me as being very neutral sounding without excessive midrange warmth or other colorations. Resolution, focus and definition from top to bottom were excellent. Most users will find this to be a very revealing DAC that can dig down to expose the smallest details of the music..."
I listened and demo'd the Chord Hugo, Mytek 192, M2Tech, Young DSD, Auralic Vega, and Wyred4Sound and it came down to exaSound e22 winning.
Decibel - a very straightforward to use Mac OS X audio player with a clean and user friendly interface - becomes the first Mac OS X audiophile-grade player with ASIO support.
"...What is absolutely certain is that the exaSound represents fantastic value in terms of the results it produces. I now find myself playing music through the exaSound as a first choice because it sounds so good on my system and is so convenient. I cannot see myself purchasing another CD."
"I am impressed by the sound quality! The e28 DAC is really a fantastic piece of equipment. I truly believe that buying your DAC was the best choice. I am still excited with the sound of the e28."
"We’ve just tested our aria music server with exaSound e28 multichannel DAC, I am happy to report that aria nicely plays both multichannel PCM FLAC and native bitstream DSD64 files via the e28 USB input. An ASIO driver from exaSound has to be pre-installed on the aria server. We believe this is another aria’s “first” in the audiophile music server market... "