I looked at the #8 and the S5.5. In the dealer's showroom the #8 was marginally more appealing to me with the same Legacy speakers (various models). Ultimately I selected the Pass XA 25. I felt it was more neutral with the Coda amps having a bit or warmth (could have been the speakers though).
I have the opposite issue regarding speakers. My Acoustats have a db83 rating and I was concerned the XA 25 would not have enough power for them, in which case I would have looked at the XA 30.8, or reconsidered the Coda options. The XA 25 has no issue with the my inefficient giants. It does get a bit warm, but it is definitely worth it.
Have fun with the search.