I've heard Bryston with Spendors and the pairing was really very good - most people say that Harbeths and Spendors have similar sound characteristics. I should admit that I have no personal experience with Harbeths, so take my comment for what it's worth.
I have had a pair of the Harbeth ES7's for several years now, and I have been very happy with the ARC D-130's. This amp has sufficient power and brings out all that wonderful inter detail that the Harbeths are so excellent at.
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