Blind guardion is powermetal as far as I know,so check out:
www.sonataarctica.info/
www.dragonforce.com/
dinges uhm,Kamelot are also worth checking out.
also if you dont already know them you MUST hear CHildren of bodom (they're simply amazing)
www.cobhc.com/
as for tristania,I dont really like that band much nor the music they make,but I can advise you Opeth since they are simply amazing too,the singer both uses deathmetal grunts and very very touching clean vocals and their best album in my view is Blackwater park,wich if I were you,you should DEFINITLY hear cuz its a perfect album.
Manowar is more uhm...anthem like heavy metal in my POV..other cool heavy metal bands are Dream Evil,Hammerfall and definitly Edguy
If you happen to start like melodic deathmetal btw then Arch-enemy,Dark tranquility and (old)In Flames is some very good melodic death from the Gothenburg scene.
So far for some very very very basic stuf,sadly enough I dont know a lot of heavy metal,im more into Death/black/doom
You can always try searching
http://www.metal-observer.com/,its a very good site with reviews and mp3s
__________________
Member of the " Pessimists Club "
