If the speakers will be close to the couch that makes me think you have a relatively small room, so another vote for QS surrounds. M2s are great as surrounds if you can put them a fair distance away (so room reflections can help to diffuse the sound) but in a smaller room the QS surrounds make a huge difference.

M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8