Price: under 500. Doesn't matter if tube or solid state.
My cans are: AKG K550, Sennheiser HD598 and soon to be ZMF modded Fostex's. they don't need heaps of power and I want something I can carry to and fro to work.
Was looking at the ALO The Pan Am, and it *almost* got it right but it had the 1/8th single ended output.
I'm also looking at the Fiio E09 since I have the E17 already, it has both 1/4th and 1/8th which is cool but I'm wondering if there's any that have 1/4th and balanced.