I think my most fragrant dayliliy is Hyperion. It's super old, yellow, and plain as can be. I really love it because it's so simple, even thought it's yellow. I used it a few times to see if it passed along the scent to it's babies, and it did. I think the seedlings smelled even better than it does, but it's not something that you can smell from a distance. The seedlings were all nice, and not plain, so it's a good one to use for scent.
Vickie, I totally agree about orange and white, too! Orange is my least favorite color, probably because it's my sisters favorite.
I'm trying to get more orange though, because it's good to use in hybridizing. White has grown on me, especially with daylilies. I really love white daylilies. But, other flowers that are white just don't do anything for me.