If you want a hybrid headphone amp, then the Millett 'Starving Student' is highly regarded. In fact it's so outstanding there isn't really anything else in the same league. The problem is, you can't get the tubes, and if you want to go with a variant, like the 12AU7 version, you can't get PCBs. That's to the best of my knowledge, somebody might know better
Fred_fred2004 made his own PCBs, you could ask his advice.
As for a DAC, there are lots of kits on ebay, or do a search here.
I built one like this:- http://www.ebay.co.uk/itm/DAC-2496-AK4393-DAC-KIT-With-CS8416-AK4393-5532-/221197997558?pt=US_Home_Audio_Amplifiers_Preamps&hash=item33806d95f6
...cost very little, no complaints.
Or from here, there's Cobaltmute's GrubDAC:- http://www.head-fi.org/t/495043/grubdac-step-by-step-build-guide
Of course you can build the Starving Student point-to-point...
Edited by wakibaki - 3/11/13 at 6:24pm