after ur done with wat u hav u can check these..
along with wat the guys already mentioned
full metal alchemist and soul eater
hav fun ^__________^
One Piece, Beck, Slam Dunk.
Greatest shonens out there, and they're not short, you won't get bored
One Piece for gods sake xD
Otherwise: Eyeshield 21, Fairy Tail, Black cat, 666 Satan
Ava&Sig by Ravona
"There is nothing either good or bad, but thinking makes it so." -William Shakespeare
ipsa scientia potestas est
as others have said, one piece is definitely a must read - evntho you've got 500+ chapters to catch up ^_^;;
KHR is good too, actually, you should read all of the JUMP series. - unless you're into shoujo, but since it's posted in shounen im guessing you want shounen.
but for gintama, i personally think watching it is better.
Avatar and Signature by Ravona