I forgot what it was, but the monoamps have a slight advantage over the stereo amps. EJ posted it once in their AVS thread. It is minor, but enough that us audiophools would prefer that config. I see no issue in biamping, but I have to tell you the SX1000's are all you need to drive the HT3's. I can try the bi amping thing after my GTG as I have 3 sets of outputs on my preamp; 2 high and 1 low. And some of those attenuating Rothwell connectors if need be. I believe the monos are actually closer to 600 watts output. The website has never really been updated.
BTW, Rick says their new preamp will be pretty special with his custom designed no noise volume control. But no tubes to roll in that! I still may give it a whirl.
If I did get a multichannel amp I would break each channel in on a full range connection for the 300 hours so that each was fully ready to go into battle. Certainly the upper ranges will not work very hard as the demand is much lower, but breaking it in that way could take forever and perhaps turn someone off if the bass cleaned up and the top end didn't. I know Dennis has a hard time with this breakin idea, but the sound most definitely changed for the better after the first 20 hours and then slightly more after that. I think it is the dielectric breakin more than anything of the components.
