I would highly recommend this design to anyone:
http://members.chello.nl/~m.heijlige...tml/dactop.htm
The digital and low voltage PCB and other hard to find Digital components can be ordered from Tentlabs. You will have to make your own high voltage/output PCB though.
I built this design and have been very happy with it. You can find 2 further posts in the gallery under "DIY DAC" in the "others" section