Entry level speakers for tube amp?

I'm looking to purchase a pair of speakers (used or new for $400-$700) to go with an Onix SP3 amp. I've read about the Klipsch Heresy III. Any other suggestions?
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Would it be a good match with a low powered tube amp like the Onix SP3? Are they sensitive enough?
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what's the advantage of the Forte II over the Heresy III?
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You could get a brand new pair of either wharfedale diamond 225’s or the original Elac b-6. They both love tubes, and they are cheap but great sounding. $299 for the diamonds, $250 for elac. Both have been raved about in sterephile, and the diamonds won product of the year several years ago...
Hope he’s not still looking.