GoBots: Battle of the Rock Lords (1986) - IMDb
I don't think this film as had any kind of decent release in years, it's got a great voice cast, and any film that can make me buy of toy of something that turns into a rock must have something about it.
I'm not even sure this is something that would be considered with it being a bit lightweight compared to some of the other suggestions, but I would love to see a really cool release of this with loads of bonus features and cool artwork.