I've had the Stepdance for a while now, and have been listening using the SM3, Denon D2000, and Beyer DT800/600.
While they all benefit from the Stepdance over older amps like the Predator or D10, the Denons really shine. Their bass is more liquid, and I think the Stepdance overcomes the recessed mids problem the Denons have with many amps. That said, for acoustic or classical music I still prefer the DT880/600.
I'm on the LCD-2 waitlist, so that'll be a good addition to the mix.
So far I have been using it only with the iMod, although I have the μDAC-2 and HDP and will try them as sources.
zilch0md,
That is really fantastic what you've done with portable batteries. I like the idea of a huge mAh battery for home use too. Actually, a diy voltage regulated circuit with additional buffer capacitance might go with a large battery like that quite well, although that's a bit more involved, especially if you want it to look polished and professional with a metal housing. I'll have to keep RC batteries in mind in the future . . .
What kind of bag is that in your pictures? I've seen a bunch of camera bags that would fit for transporting it, but few will accommodate the iMod and ALO cable.