For the best noseart I've seen, go here ---> http://www.starshipmodeler.com/store/decals.htm#1
Scroll down to near the bottom. Better yet, they all are used primarily for Starfuries from the TV show Babylon 5, but they can be used for any nose art or wing tops/bottoms. They also come in all different sizes, so you really don't have to choose, just order them all. 24 bucks gets you like 100 decals
If you do not like what you see, or need a special one-off, while you are at the SM site, look up JTGraphics. He's the one doing the decals. He's very good, very cooperative, and reasonably priced too!