My guess is any of them, particularly if you start in LA or San Francisco. In view of Allan Edels' and Dan Varner's recent posts I think we should continue having this discussion online, and hear what the paleoartists themselves have to say. You're plugged into a whole community here that would be positively affected by such a show. They'd love it. But also, museum people, university presses, libraries, everybody has pressure to pull their weight now, show some profit.
Dinosaurs are the incomparable outreach for the sciences.
But the fine arts have never been able to tap into them. You're not asking them to do what they don't want to do. David has spoken well of you, and I could ask him. David and Eleanor know the West Coast. Stanford just re-opened their museum, and they've dumped most of the permanent collection to refocus as a gallery for traveling shows.