If you're interested in less distortion in general, there's a key on your keyboard called "caps lock" that will cause your letters to become less distorted.
Anyway, in terms of the question being asked, your lens doesn't cause distortion of the nose. That's 100% caused by the distance between you and your subject. Move further back, and you'll get less distorted noses. Move TOO far back, and they will look flat. The ideal is roughly 15ish feet away.
Thus, depending on what sort of photo you want to take, you should choose a lens that lets you fit that in the frame at about 15 feet.
You can sit there and do a bunch of trigonometry to figure it out, or you can just go to a camera store and try stuff out and point it about 15 feet away to get a feel for what seems right to you, and what you think would comfortably fit a person the way you want to shoot them (head and shoulders? full body?)