Tough decision. You will gain that upper bass you seek going up to the larger speakers, I did the same upgrade many years ago, only went to the M80. I think you would benefit more from the VP160 upgrade first if you watch movies more than listen to music considering how much info comes through the center during a movie. If it is a more music than movies situation I would go with the M60 upgrade first.


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70