Not sure that it is a BIG difference if you look at the graphs. The 80's can handle more power, but my 60's fill my 30ft x 30ft room just fine. I would use the money for an EP500/600.

The factory outlet will also save you some dough.

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