A model 200 would also have more power by virtue of it's independent power supply verses the shared power supply in the 770. The 200 cannot be easily used in bridged mode, however it can be done (almost any two identical amplifiers can be bridged) - just not by the consumer.

As far as current delivery - you only need enough current capability to deliver rated power output into the lowest impedance presented by the speaker. Amplifiers with more output transistors and larger power supplies will be able to deliver more current than other amplifiers.

[This message has been edited by soundhound (edited January 28, 2004).]