Certainly more american power metal. Crimson Glory, Heir Apparent, early Queensryche, early Fates Warning. Rainbow's Rising for the historical viewpoint...
Before power metal ment 'happy metal like latter Helloween' it was just 'Heavy Metal 2.0 newer and improved!'. Certainly that era needs to be covered, though there's this trend of retconning that stuff as vanilla heavy metal, but then if you listen to Legend and Gargoyle back to back you see the distinction was very real! You say Jag Panzer cross from power metal territory onto other things, whereas Jag Panzer are what power metal IS from that point of view. Heavy Metal, only louder, faster, more precise, more expansive, more everything.