In addition to the DACs mentioned, please also consider:
Kevin Carter's RAKK dac II (same chip as CIA VDA2 but radically different approach and analog output stage)
Peter Daniel's/Audiosector NOS dac
Hagerman USB Chime
Also...Aspen/AKSA amplifiers, Greg Ball's SKA designs and Aussie NX150 amplifiers. I'm guessing these are state of the art solid state designs that will compete with the likes of Classe Audio, Halcro, Boulder, Rowland, etc...but much, much, much cheaper.
Anand.