As an alternative to looking for a new company (which is not a bad idea) I can suggest a path taken by a peer of mine in a similar boat. They and another go-to engineer petitioned to start a 'new projects' division and basically work on an internal spinoff. Two people with the backing of the company, a decent amount of freedom, and a mandate to build something that customers will love and buy. They had an exec sponsor and good relations with much of the e-staff. They got to experience all the "fun" of a startup with more of a safety net.

This way you pick those people who you think can help you grow and put a clear and hard challenge in front of yourself.