Have you already found your Helen of Troy?  

I can't think of that many actresses that have played Helen of Troy. Apart from Rosanna Podesta there is that German actress - is it Diane Kruger maybe? Anyway both are very pretty but I just never think of Helen of Troy as being a blonde. I think a brunette would suit the role much better. So bearing that in mind I think Elizabeth Taylor circa 1960's would have been perfect for the part. As for current actresses I'm not sure - the Indian actress Ashwarya Rai (think that's how you spell it!) is in my opinion the most beautiful actress around today so she would get my vote.