Gintama
Naruto(Shippuden)
Bleach
One Piece
Fairy Tail
Hajime no ippo
Death Note
Air gear
Fullmetal Alchemist(brotherhood)
Samurai Champloo
Dragonball(all)
Heres a list of shounen anime, if you click on score it would give you the top rated shounen anime on the site. There are also reviews and information that you can read if your interested in watching it.
http://myanimelist.net/anime.php?genre[]=27
It would also depend on what other genre's your looking for, like romance/drama/action/harem etc, but im pretty sure you'll find loads that you want to watch by looking there