Well, I'm mainly into metal but I always have space for great classical music pieces.
Try symphonic metal. I listen to it all the time. It mixes metal with classical influences like choirs and sometimes orchestras, sounds epic. Some power metal is like that too, focuses more on guitar and keyboard though.
I can't remember if its Veigar, Q factory, or two steps from hell but they have epic orchestra stuff with heavy guitars mixed in on some of their stuff.
