I don't know how helpful this will be. I'm very familiar with the SP100, but I haven't heard the new version at all, and I don't even know what was changed. Having said that, I have also owned 2 different Proac models, and they are quite different from Spendor. They have better precision in imaging if that is important, and they also have quicker transient attack. The Spendors have great flow and coherence, and vocals are great.They are different enough in character that you should really hear them both. As far as the Usher goes, I have not heard any of them, but I would be surprised if they could beat Proac or Spendor. By the way, in the price range that you are in, try to hear the Harbeth Monitor 40, or 40.1. You will be surprised.
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