Mezzo 6 are fine speakers but don't pair too well with Cyrus equipment. I have Mezzo 6's driven by Cyrus and I'm looking to change the speakers as soon as the budget allows. Need more bass.
If I were you I'd buy the system first, then decide on the speakers. What you're doing riight now is deciding you want a red car, then figuring out which car it should be.
I should be sponsored by Cyrus and Chord (and B&Q)!!