Tweekerman, with the right amp even 70W can be enough for Soundlabs. I am using a Berning 270 with mine with excellent results and have very good BASS; (no softy bass either) no extra sub required in this room let me assure you :)
I agree that electrostats in general need a fair amount of quality power and my Soundlabs are no exception but 70 killer watts from the Berning, believe it or not, does the job very well in my modestly sized room.
True, I wish the esl's did not require so much juice to do a moderately large size listening area justice but fortunately my present room (27'x12'x7') is small enough to be happy with 70 high quality OTL watts. Now, wouldn't it be great if you could get bass from a smaller esl panel? What a dreamer I am :)
Chris