Adam,
Welcome to the Aspen forum! You should hear it now!!
If impedance does not dip below 3.5R and/or sensitivity is higher than 87dB/watt/metre, then the 55W is normally adequate. If it dips to 2.5R and/or sensitivity is lower than 87, then the 100W is the go.
That said, the new Lifeforce seems to be rewriting the rules. The 55W version sounds almost as big as the 100W AKSA.
Darren, thanks for your reply, yippee!! My SBIII has arrived!!
Cheers,
Hugh