If anybody sits in that seat against the wall outside the speakers on a regular basis I would suggest the VP160 due to the better horizontal dispersion it produces. If the main sweet spot is the only real concern and you really don't care about that off axis position too much then go with the VP180.

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