I am going to go with Sarah Jezebel Deva, formerly of Cradle of FIlth---She has such a powerful voice!! 8-]] 

I love Liv Kristine's voice, so sweet. Also, Anita Auglend (The Sins of Thy Beloved), Floor Jansen (After Forever, Nightwish), Martina Astner (ex- Therion). I like many others but these are my favorite ones.