Well I've been all over the map trying to figure out what amps to use for the fronts and center. The 2200's on paper seem a pretty close match for the needs of the 100's and CC-690 but I do think more power would be better. In fact, if I can afford them I'd be inclined to go with an amp of about 500WPC (8 ohms) or at least 300WPC (8 ohm).
I am very interested in the new D class amps from Bel Canto and Halcro to name just two, but the price for them is beyond my bank account. The idea of an amp that's as much as 94% effecient is very appealling on two counts: reduced electric bill, and fewer cooling issues. The designs from Halcro, for example, appear to offer pretty much class A fidelity at about one third the power requirements!
Brian