There is a new maker of Dyanlos, which have the same design as the Gilmore Lite.
I have been using a dynalo with my HD580 for a while and have been happy with the results. I have not heard any Beyerdynamic HP and do not know how they would sound on the amp.
I bought an Oehlbach cable for Earl. Great communication and fast shipping. When the package arrived it was well packed and in fantastic condition. I would recommend doing business with Earl at anytime.
I am enjoying my MS-1s with a Little Dot I+ which is in your price range.
Little Dot I+ Hybrid Tube Transistor Amp Amplifier! - eBay (item 200312519788 end time Mar-22-09 13:54:31 PDT)
The only problem is that it made me buy a pair of Grado 225s because I liked the sound so much.
I bought a Little Dot I+ from Aman. It was in great shape just as he had described and it was shipped quickly in a well packaged box which as also double boxed.
It was a pleasure to do business with Aman. I would not hesitate to enter a transaction with him.