The woman who co-owns my gym is definately up there. Obviously you can't see her, but she's about 5'11", blonde hair, sexy smile and toned like a female body builder (but not beefy). She's a drool and a half.
But if I had to pick someone everybody knows, I'd pick Jessica Alba, in that skintight blue number she wears in Fantastic 4.... some day, I'm going to con a girl into wearing that for me...