Sutts,
I respect your choice, but those ARC amps are way WAY expensive and would seem a bit out of line relative to the Mani-2's cost. I am sure some other very muscular tube amps might work too (e.g., VTL and Manley), but for the control and drive the Mani-2's need, solid state is the more practical choice as you note. I bet five Mani-2's that is one fine-sounding surround setup you have there...
Also--one other amp I heard only once on the Mani-2's, but it was most impressive, was a big Goldmund amp, I forget the model number, I want to say 28 or something like that? Very quick and airy sound out of the Totems, but a touch lighter in the bass than Rowland for example.
I also like the Model Ones! Don't like any of the Totem tower speakers however, I guess I'm just a monitor kind of guy. I now use ProAc Response 1SCs and like them quite a bit. Sweeter than the Model Ones but not as ballsy. Both great little speakers.