New to Bi-amping, Crossover and Tube amp

I have decided to bi-amp my speakers this is my first attempt, and I would appreciate some opinions. I was thinking of using a Marchand Xover and a Cary 120S for the highs, and keeping my beloved Cary CAD 500 MBs for the low end. I have Maggie 3.6R's and want some opinions?

What Machand Xover, or is there another suggestion? Also, is the 120S enough to power the mids and highs on the Maggies? I also thought about a VTL or Rogue, but I love the sound my Cary gear makes with the Maggies so thought I would try to continue the trend.

Suggestions and advice is welomed and appreciated.

thx.