I have had serveral pairs of 3.6R's over the last 6 yrs, and here are some of the amps that I have used:
Parasound JC1's (sublime, very full rich sound)
Innersound ESL 300 (massive power, never runs out, very detailed)
Bel Canto Ref 1000's (massive effortless power, very detailed, not warm)
McIntosh 500 ( not a match )
Cary Audio 500MB's (tube like sound, HUGE Bass, great match)
Bryston 7B's (power, nice, but not my favorite)
Pass Labs X 350's (good amp not my favorite)
I have not tried, but hear that the H20 500's and Spectron Musician III (all versions) are great matches.
If you can get an Innnersound ESL used to start, that would be what I would do. Go from there, great not too expensive amp, made for planars.
My favorites are the current set up with the Cary's.
Good luck, love the Maggies.