First of all, to the guy that mentioned Singlepower, WTF? Did you ever read any of the threads here about Singlepower? Just to summarize, DO NOT buy a SInglepower amp, erase that from your mind.
Second, sorry to tell you, the high-end electrostats will slaughter any dynamic out there. The HD800, PS1000, Edition 8, T1, etc can not compete with an electrostatic transducer. The high end orthos are better, but if you want the absolute best headphones, you need Stax or Sennheiser electrostats. And you will need a super large, super expensive amp to drive them. Have fun with that.