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I was curious about the power rating when biwiring. How do you figure that? Would it still just be 65W to each speaker or 65W to each line to the speaker (or 130W).
Yes- no real change in "power rating".
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What would happen if you went to a bi-amp solution? If that's the case here, I could definetely see getting one of those wonderful 7.1 channel amps and sending double power to the mains.

I think you may be confusing bi-amping with "bridging" an amp here, Benjamin. I would not believe the new 7100 would come with this capability (bridging) and allow you to "double the power" to your speakers. So, the answer would be- no. Hope this helps!