Audiophile Quality from Computer, Best Dac's out t

This link will explain The Computer as High Quality Audio Source

http://www.belcantodesign.com/pdfs/BelCantoComputerAudio.pdf

What unit are you presently using

Which one out there do you fill is the best at giving you audiophile quality regardless of what you are using.

Mention powercords, interconnects and usb being used.

What sofware are you running with it.

Whats you would like to see in these units that are not presently incoporated in them now.