Get the VP160 or 180 now and then add the M80s for the next upgrade later this year or next year, your sub is plenty strong enough and the difference in surrounds is not worth the upgrade when you can gain so much more from the front. There is so much info in the center channel that a full range speaker really adds to the HT experience, IMO.

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