EDS,
The Thule pieces are:
AV100 $4295 (no video switching)
AV100S $4995 (has video switching)
According to Anders Thule, at CES, that's the only difference. Both are reated as 6x150watts/channel.
edit
Oops, I left of the AV120S, whch ups the ante to $6195 and the power output to 6x180w/channel.
Best Regards,