MG 20.1 or Wisdom audio m-75

Don't even think of the 20.1's if you don't want to modify them you'll be getting 15% at best of there potential performance.

The Wisdoms are a strange animal.They require a large amp to drive the ribbons and,by using a different amp for the subs-they won't blend.These also tend to produce moreinstrument,then hall acoustics.I would lean toward the MG 20.1s.Had you considered a pair of Yankee Audio planars or hybrids? Replaced a set of CLS with them and didn't look back.Or possibly the Gallo References/Ultimates?

The Wisdom Speakers are great speakers. They are very neutral. The sound from the speakers is what the amp(s) driving them sound like. They work well with the Rowland and Edge amps. They work VERY good with the Parasound JC-1 amps. It is best to have the same amp on the Woofers and the Planers.