Meh. This will sound dorky, but I find a lady's personality to be as important or more important than looks. I'm not gonna lie. Looks are important to me, and just about anyone. I take a shine to a real spark of life in a lady's eyes.
If I had to go with a favorite looking actresses, it'd be Michelle Rodriguez, Milla Jovovich, Emily Blunt, Summer Glau or Kate Beckinsale.
That, and I've never seen a blonde that I've found even remotely attractive.