The West theater in Duluth MN.
We have an Imax elsewhere in town but The West is a single screen theater owned by a local couple who wanted their old neighborhood cinema back.
I don't go to the movies often, but I always try to go there. And it's the closest to my house too.
You can always also get a cheaper sentimental ring and go out ring shopping together for the official one.
That way you keep the surprise and she gets the ring she wants, plus another ring and a nice memory.