According to Axiom it is designed for rooms around 12 x 20 x 8, so your room most likely would be ok for the 175, placement is key. As Adrian mentioned, a lot depends on your goal for its use. Since you splurged for the m80's, maybe an EP350 from the Factory Outlet would fit your bill.

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