You're best bet is probably the Flow Era. Though enjoy more stability and pop than your Hero.
And I'd actually recommend you just stay with the regular M9's for now. I think the new strap needs some tweaking.
The only reason I was interested in the Flows from previous years is due to the toe cap. Is there a problem with that? Next binding choice would probably be Rome 390's. Other binding choices would be from Burton, Flow, Ride, Union, Rome, and Forum.