I like what Audio Note did. They listened to the available DAC chips and chose the Analog Devices AD1865 based purely on sound. When it was discontinued, they bought up all the remaining stock, so they wouldn’t be forced to change over to a sonically inferior one.
They are are currently working on an R2R DAC using discrete resistors, which, reportedly, sounds much better than the AD1865.
http://img.photobucket.com/albums/v260/TomBerry/0728b2915ce0892e44fe42934e521cd9_zpsmqay4v8m.jpg
http://img.photobucket.com/albums/v260/TomBerry/b53e6cb9d8ac3cdf036c3da279a3b8d8_zpshk0zdrci.jpg
They are are currently working on an R2R DAC using discrete resistors, which, reportedly, sounds much better than the AD1865.
http://img.photobucket.com/albums/v260/TomBerry/0728b2915ce0892e44fe42934e521cd9_zpsmqay4v8m.jpg
http://img.photobucket.com/albums/v260/TomBerry/b53e6cb9d8ac3cdf036c3da279a3b8d8_zpshk0zdrci.jpg