I would buy the Cabasse.
The MUON is more a work of art/design than a high-end speaker (although it is very high-end and apparently sounds amazing, you are paying more for Ross Lovegrove's design than for the acoustic design).
If I had the money to buy big horns, I'd go for an Avantgarde.
The other stuff with millions of drivers, I think it's stupid, unless your room is a stadium.