The Denfi Space Traveler, a very new disc is probably one of the top discuses available currently (
www.vsathletics.com/product.php?xProd=2165&xSec=78).
But that doesn't mean it is the best discus for you. How far are your throws? How fast is your release? Do you prefer a thick rim or a thin rim?
Depending on your answers to those questions you will be able to tell which discus is best for you.