I would have to recommend the second paragraph options. The superlative bass the JC 1s have on my Magnepans is hard to leave behind. A point could be made for using the same amps, or maybe the A1 for the mids/highs.
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Why do you want to bi-amp? Do you think your current amp is not sufficent? Do you expect better sound quality when bi-amping. To me personally using multiple amps only makes sense in an active system. I have spoken with some speaker manufacturers and some sell speakers that can be bi-wired/amped just because there is a market for it. Not because the speaker will sound different or better when bi-wired/amped.