Iity, "just cuz" doesn't cut it with me, since there should be some reason to spend more money. Your 707 is excellent and would probably be my suggestion for a receiver if you didn't have one. There's no need to attempt to "match" the receiver with speakers; no receiver is either "warm" or "bright". A similar receiver to the 707 would be the Denon 2310.

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Enjoy the music, not the equipment.