Press releases went out for a new contennder in the headphone amplifier world: Schiit Audio. (http://schiit.com/)
They are starting off with a high current $250 Class A SS amp (the Asgard) which is fully discrete, and a $350 SET tube amp (Valhalla).
I've ordered an Asgard to pair with my HE-5LE headphones, and in their FAQ section Schiit says that the Asgard loves Sennheisers, and that it can drive cans with an impedance as low as 8 ohms. The Valhalla they say (again, in the FAQ section) is a great match with AKG headphones.
15 day trial period (no restocking fee), 5 year transferable warranty.
I'll report back on my findings.
Lastly, here's their press release: