The guys at CarToys were recommending either an Alpine PDX or Audison as well.
Dropped the Focals in today and did a little test in the driveway (*grin* see pic). About to go for a spin to see if I can actually hear it over the evil 2bular.
eta: CarToys had some of the Focal amps wired up on display. They were pretty big and I have to admit that I didn't bother giving them a listen.