As for the sub, is the PB-10 out yet? last time I heard we have to pre-order them, if the PB1-ISD is way overkill and not needed then I would definitely consider the smaller version PB-10, but from what I heard this entry sub is design specifically for HT with only LFE connection and it's not suited for stereo receiver?
By the way, I just went to SVS website to confirm that the PB-10 indeed only have one LFE connection, and they only start shipping them by the end of October, well....how about the Velodyne VX10? not sure how well this tiny little sub pair with the M2i though..