Quads vs Sound Labs vs Maggie 20.1

Any thoughts on the performance aspects,and best amp types?

I am interested in feedback regarding refurbished ESL-63's vs the newer models(I know these are bigger and more dynamic,but are they have that Quad magic?).I've read about some Quad refurbish site about to offer a dipolar woofer,which seems interesting.

Also,the big Sound Labs speakers have never left me overly enthused,but I could have been subject to poor set-up,as these have a loyal following.

What about the big Maggies?I had a friend who modded the 3.6's to amazing effect.Do the 20.1's benefit from after market mods.

Best amps for each speaker?

Thanks in advance