Let's hear your nominations.
In terms of simply stunning I think my personal favorite is Jennifer Esposito in Dracula 2000.
She would closely be followed by Yutte Stensgaard from Lust for a Vampire (most people hate that movie but I feel it is underrated).
Equal consideration would go to Madeleine Collinson in Twins of Evil.
Honorable mention to Mathilda May (google for pics, I don't think I can post them) from Lifeforce. If we include TV I would have to add Jessica from True Blood.