Plinius is not the answer for Maggies. Just not a good match. Try Parasound JC-1 monoblocks, or any of the Bryston amps that produce more than 400W at 4ohms. But the big bad boys your really want are Innersound. Read some reviews, you will realize they are mades SPECIFICALLY to drive this type of difficult load. No heat from the amp as well. Mono 800's, or the ESL 300's great amps.
Good luck
Good luck