I'm going to interpret the question as "what is your favorite body part on a woman", since saying "which is the most important to look good" is a bit ambiguous.
Like Liberator said, a woman should have a pretty complete "package" to say she's lookin' good, but if she has a great pair of legs and a nice ass...then
Overall, I'd combine quads & calves = LEGS!
So, how 'bout a pic of your "nice butt, nice breasts, nice legs" Bri???
The way I see it, having a good bodypart outweighs the bad in having a slightly flawed part. For example, you can have awesome tits, and normal-nothing-great-about-em legs.
But legs and ass definetely is THE combo.
nice butt. thats the givaway. another thing I've noticed is that women with nice diamond shaped calves always ALWAYS have a good body. so calves is my second choice.