Active crossover gets into a serious design issue: replicating the crossover design that the speaker manufacturer worked out. Can you do a better job with your active crossover than the designer did with the internal crossover? And do you want to rip into the cabinet to bypass the original one to get full benefit from the process?

If you have a Studio CC and Studio ADP's, I don't think that bi-amping with two 200W channels is going to perform much (if any) differently than a single 200W channel (either bi-wired or with a good jumper). I can't imagine my Paradigm's benefiting from any additional power, and my Studio/CC and Studio/ADP's are driven by 165W each. You could get a 7500 and drive all three speakers with two channels left over for zone 2 (or a future upgrade to 7.1).