Cant believe anyone has said Iron Maiden.
They're still #1 Metal band in my book.
I also second the recommendation for Blind Guardian.
A few others:
Edguy - (listen to songs: Theater of salvation, tears of the mandrake, how many miles, lavatory love machine)
Nightwish - (songs: She is my sin, Come cover me, Beauty of the Beast)
Sonata arctica - ( OP said he liked it so heres a song you might not know OP. "Peacemaker" its from a B-side single release).
Stratovarius - (songs: Black Diamond, Hunting high and low, Eagleheart, Destiny).
Kamelot - (songs: Wings of despair , Farewell )
Also if you like folk style metal with violins and flutes and you dont mind listening to lyrics in spanish:
Mago de Oz ( Songs: Fiesta Pagana, Molinos de viento, Jesus de Chamberi, Ciudad de los Arboles ).
Easily the best folk/power metal band in the world at the moment.