The SR009's are remarkably "un-picky" and did indeed sound good with everything in my listening sessions. The SR-007's Mk2's, on the other hand, are significantly more demanding. I think I would have no problem living with the 009's and take my time getting an optimum amp to pair them with, vs going with the 007's and ponying up for an amp upgrade right now. I do know one thing now... Lambdas are no longer an option for me. I have been ruined.
If you haven't seen yet, there's a meet near LAX in August. There should be SR009s and other electrostats there for you to try out. :)