I haven't heard the M80, but it would seem to be similar in terms of frequency response to my Paradigm Studio 60's - and the original LFM-1 has done a great job of integrating with them (particularly for music, which is where I had trouble integrating my previous sub with them) in a room that has slightly more volume than yours. Can't argue against the Axiom subs, but I'd definitely agree that the Outlaw subs are worth keeping in consideration.