If your going to get the m80's, you need to be sure your receiver will drive their 4ohm design. Not familiar with the Z1, but I know some others have had issues with their Yammy's going into shutdown mode if they get to hot.

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