[kennyt]

Wireless should be fine, IR doesn't use huge bandwidth.

Your receiver will only have seven channels of amps, so you can do the 5.1 and the second zone, you won't have any left over to bi-amp the fronts.

Does it help? Yes, is it worth adding another receiver to do it? Likely not. I went through the bi-amp to tri-amp to fully active, adding amps did make a change, but not like going active.