Angel Dust
Ark
Blind Guardian
Demons & Wizards (blind guardian & iced earth members)
Edguy (the new album, hellfire club, is great, the rest are just avarage)
Elvenking (amazing power/folk metal)
Hammerfall
Helloween
Iced Earth (the new album isnt that great, ripper is a tool)
Into Eternity (they are a mix of like power, death, and thrash, good stuff)
Kamelot
Lost Horizon
Masterplan (all power metal fans need to hear this band)
Mercury Tide (angel dust vocalist's new band)
Secret Sphere
Sonata Arctica (silence is a good album the rest kinda suck)
Symphony X
Symphorce
Thunderstone (generic as hell, but fairly decent)
Im also gonna list a few non-power metal bands that you might like as well, all clean vocals.
Charon
Evergrey
His Infernal Majesty (H.I.M.)
Nightingale (one of dan swano's many bands)
Nightwish
Odyssey (another dan swano band)
Poisonblack
Sentenced (their old stuff is like death metal, but the newer stuff you would like)
Skyclad (folk metal!)