I see you already have some excellent advice going. My 2 cents worth:
- That latest darker rust sample above (from "Big" - I think) is looking good.
- Definitely loose the white in the kitchen. I believe Rust Oleum has some specialty formulations designed for this purpose
I've recently become a fan of white cabinets. I say keep em. On the other hand, I am not a fan of white appliances. But that's just me. I'm a stainless type of guy. However, in a theater room, I'm not sure it matters much. I say leave the cabinets alone.