They both use an 8" driver and a 150W amp. The Super 8 is smaller (12"x12"x12" enclosure rather than the 17"x11.25"x16.5" of the LFM-2). The LFM-2 is a bit heavier at 37lbs versus 31lbs (which could suggest greater rigidity and resistance to movement when you're pushing it real hard). The LFM-2 costs $100 less (not counting any package discounts that might be available). Output and frequency response are basically the same. I think both would match up with the Orb speakers equally well, and the Model 1070 will work fine with both.

I can think of a few questions that might help you decide. Can you get the Super 8 for the $300 that the LFM-2 sells for? How do you feel about the looks of the two? (The round gray grille on the Super 8 doesn't do a lot for me, but personal taste is big when it comes to speaker aesthetics.)