I don't know too many bands with female vocalists. I do not like Arch Enemy, I think Angela's growls are rather terrible. But that isn't the only reason I dislike the band, I'm not exactly a fan of melo-death in general. A couple of older death/doom bands I enjoy though, namely Derketa and Mythic. They're actually all-female, but the vocals are pretty damn vicious (which is actually a positive term for death metal). I also like Arkona, which is a Russian folk metal band. Their vocalist has a mix of pagan-cleans and decent growls.
That's about it for me, really. I'm not a fan of gothic/rocky stuff either, so things like Nightwish and Within Temptation don't appeal to me. Now on reflection, there are very few females in bands I listen to at all. A shame, really.
Edit: Might as well link something.
Quality of the Derketa song isn't the greatest, but hey, it's demo-level 90's death metal, what would you expect? If you're an extreme metal fan, bad/raw quality shouldn't be much of a problem anyway.