You dog, you.
We use a system where the executive board has virtually all of the decision-making power, with heavy coach input. The head coach is a voting member of the E-Board, but assistants are not. We've found it works for us, but you've got to have the right kind of coaches, who offer their advice but aren't so wrapped up in it that they demand every decision goes their way. We've been blessed in that regard, but with the right safeguards, you can protect against coaching despotism.
I think that system requires the right kind of E-Board people even moreso than the right kind of coaches.