Nightwish is the closest I could find. (mostly the older stuff with Tarja Turunen, her voice is phenomenal)
I also keep hearing about Epica and After Forever that are mentioned to be similar to them, but haven't had a chance to listen to them yet. Always forget it when I can...
Epica, Evanescence, and Theatre of Tragedy (prior to Musique) are both good. ToT's vocals are a little softer, and I wasn't a fan of where they went with Musique.
Evanescence isn't my cup of tea. I'll give Epica and ToT a listen though... I just really need to remember these names when I'm home, and not at work. :\