I would make sure the 80's can be driven by that Yamaha model, some have had issues handling the 4ohm load of the 80's. In my opinion the 60's would be totally fine. My HT area is 15' x 25' x 9ft ceilings that opens into a 30' x 30' total room. The 60's have no problem with that area.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85