I have the Focal Aria bookshelves and they are some great speakers. I have not heard the Chora line though. I really enjoy them. They are really easy to power and have the ability to put out great SPL for their size. I do cross them at 90 hz with a pair of sealed 10s as subs.
As far as the amp goes I would use the older Denon receivers. I see no reason to spend the money. No reason you can not integrate both to help your 3700 if needed.
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