I originally bought a set of M80v4 and picked up a VP180v3 at the same time as it was cost effective to do so. Quite honestly, I didn't find it lacking in any way.

Most movies are not putting major sound into the center channel anyway, so the major difference in base you will get from the v4 is wasted as the dynamics required is not needed.

Are you mainly listening to music in 5.1?

Anthem: AVM60, Fosi DAC-Q5
Axiom: ADA1500, LFR1100 Actiive, QS8, EP500, M3, M3comp, M5