Finally spent some time with the Denon AHD 1001 and the Sennheiser HD 457s. Got to say the headphone experience is interesting ... personal like.
I read some reviews of the 457s which damned them with faint praise. They are more efficient than the Denons. The Denons sound great. I don't mind the Sennheisers either. I'm listening to them through a really low end set up - my old Logitech computer speakers and sub have a jack in the volume/on-off pod.
So far, some Andy Snitzer, Jobim, Bach, Dire Straits, Cream, Enya, more Clapton, Pamela Yorke, and both phones sound really good to me. I think the edge goes to the Denons.
Think I'm going to get the L'il Dot and maybe a step up on phones.