Symphonic Metal?

Apocalyptica has some fun tracks but there really isn't much 'symphonic' about them. They are just a metal band who play cellos as if they were guitars (atleast based on the little I've heard by them).
 
I remember thinking it was a cool concept when I first heard them...then I got bored because all they do is play cellos. I mean...how much fun can you have with one instrument.

If I want heavy, I'll go heavy...not cellos pretending to be heavy.

Not to mention my experience with them is only cover songs.
 
I don't think Therion is very good, but that's just me. It's like they have all the tools to sound great, but they just fall flat - way too simple.

Bands that use symphonies and choir-esque vocals that I like:

Savatage
Nightwish (Once)
Tristania
Diabolical Masquerade (Death's Design)