Because this thread needs more horseshit: 
 
I think I may be in a position to do a wee upgrade in the next few weeks.  Can anyone offer suggestions?  I have HD600s, which I like a lot.  I consider my sources okay, some of them at least.  My various amps, however, will not get me into anyone's pants at a headphone meet (a couple of portables and an L-pad).  I've never heard anything electrostatic, and I'm Stax-curious.  So, can Senn fans comment on what I otter do?   
 
My obvious options, as I see them given my budget, are along the lines of either upgrading my amp to something decent and experiencing the scalability of my HD600s, or getting a set of Stax SR-Lambda with an energizer.  Would the Lambdas be more of a lateral move, just a different flavour but not necessarily better than the HD600s?