And Dan, those Woo amps are awesome. If I ever take my setup to the 'next level', that's where I'd go.
You've got a killer setup there!!
I also have a Lite DAC-AH that I've modded some. Anyone who wants to get a nice DAC and doesn't mind doing a little bit of soldering work for fun, the Lite DAC-AH is where its at. It's a NOS design (non oversampling) which basically works by having 8 DAC chips running in parallel for the analog output. The theory is that any artifacts in one chip get "evened out" by the rest. This gives a more organic sound.
While I haven't done a head-to-head with any other formidable oversampling DAC, I'm happy with mine. I saw a huge improvement over my Portable USB DAC when I had it.
If you get a good tube amp don't forget about getting a good source
Garbage in, garbage out. So, that means if you're planning on running a tube amp off of the headphone out of your laptop...eeeghh. So, get a nice DAC :-).