Lacuna Coil's Cristina Scabbia isnt gothic or really that operatic, if by gothic you mean something similar to Evanescence or older Nightwish. Speaking of which, the newer Nightwish singer is pretty far from the older, very operatic singer.
Some song of in this moment.
Flyleaf, although its not really metal and she screams sometimes.
There was a swedish chick heavy metal band, histerica or something.
You should look for that:P.
doro pesch, and her old band warlock. classic metal, but with a woman doing classic style vocals.

there are quite a few bands like that around, i've been recommended a lot in the rec thread of the metal forum, but can't remember too many at the moment.
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Gothic metal or goth metal is a subgenre of heavy metal music. Sometimes gothic metal combines the aggression of heavy metal with the dark melancholy of gothic rock. The genre originated during the early 1990s in Europe as an outgrowth of death/doom, a fusion of death metal and doom metal. The music of gothic metal is diverse with bands known to adopt the gothic approach to different styles of heavy metal music. Lyrics are generally melodramatic and mournful with inspiration from gothic fiction as well as personal experiences.

Pioneers of gothic metal include Paradise Lost, My Dying Bride and Anathema, all from the north of England. Other pioneers from the first half of the 1990s include Type O Negative from the United States, Tiamat from Sweden, and The Gathering from the Netherlands. Norwegian band Theatre of Tragedy developed the "beauty and the beast" aesthetic of combining aggressive male vocals with clean female vocals, a contrast that has since been adopted by many gothic metal groups. During the mid-1990s, Moonspell, Theatres des Vampires and Cradle of Filth brought the gothic approach to black metal. By the end of the decade, a symphonic metal variant of gothic metal had been developed by Tristania and Within Temptation.
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Try Epica. Check for example the new album: Design Your Universe

Some people do say them to be gothic metal but I disagree, it is Symphonic Metal.
"Fly with me forever high
And with these wings
We'll set the world on fire
Fly with me through scorching skies
You and I - The lie of lies"

-Symphony X
Aghora are progressive, they have a great female vocalist.
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