In a rough order:
03.Dio (Still have hope that I will get a chance)
Also nods to Whitesnake, Pink Cream 69, and Vanishing Point.
Nocturnal Rites would actually top this list but... I'm finally fucking seeing them in September!!!
And for the record, the bands that would be in this category if not for my disclaimer:
Savatage, Avantasia, Bruce Dickinson, and Dungeon.