Very interested in the SuperCinema 3. I'm wired for 7.1 and I'd like to know if you'd recommend two more SuperSat 3's for the rear channels, or if this is overkill?

Also, due to my room layout, the rear speakers wouldn't fit mounted vertically. So if I go with the SuperSat 3's, and I need to mount them horizontally, would you recommend getting the 3C's instead?

If you're set up for 7.1 then you should definitely use the SuperSat 3's for the Rears as well, to blend perfectly with the Surrounds and Fronts. If any are to be mounted horizontally, make sure to use the "C" version.