Bare in mind that, due to their high efficiency, you'll only be using a watt or two at the very most for most listening unless you're listening to a recording that is very dynamic and / or you are "trying to raise the roof" and jamming. As such, you need something that is biased above this point. Otherwise, crossover distortion will come into play and the system will become more fatiguing than it should be.
Having said that, i would think that the Ayre and Pass suggestions above would be excellent candidates. I know that Bob Bundus is currently running an Ayre amp with his Belle Klipsch ( fancy La Scala's in beautiful cabinets ) and seems to be very happy with it. You might also think about a Muse amp too, even though i've never heard them. They are supposedly very well built and combined with your Muse preamp, i would imagine that there would be a relativey good amount of "synergy" taking place. Personally, i don't think that Bryston and Klipsch make for a good match.
As far as having "too much power", you can't have that. That is, so long as the quality remains consistent over the quantity delivered.
As a side note, the La Scala's are capable of sounding SO much better than how they work out of the factory. In order to achieve this though, you almost need to build a new cabinet or do some rather radical modifications to the existing cabinet. Sean