1. NYC has Rye, Playland but you are right about not having any good steel coasters. Too bad it is owned and operated by the Westchester government. I do not think the tax payers would like to spend there tax money on a 12 million B&M masterpeice. They tried a Zamperla one looper last year but took it out because of the excessive g's.
2. If Seattle receives a Six Flags park, Six Flags has themselves a gold mine. (as long as it does not rain every operating day ;))
3. Phoenix, Arizona would also be a great spot for a theme park.