On that speaker the more power the better! If you can get the 7B go for it.
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At one time I had a 4BST powering Thiel CS7s and when I upgraded to the 7BSTs the difference was amazing. The reason I upgraded initially was becuase I could easily get the clipping lights to turn on on the 4BST on some recordings that had a lot of bass content. The 7BSTs were much better able to produce the current needed for, and the detail coming from, the speakers. Focus and listening ease was much improved. Bass was faster and more extended and the highs were sweeter. Overall, I would go for the 7BSTs if your budget can swing it.