Just got you addicted.
Gintama and Gantz are the ones that i found on accident and both so far are extreamly sweet and funny.
Gintama doesnt follow the manga all the way but i only read up to chapter 4 of Gintama. And i havnt even read Gantz but i will soon.
Also i think they should make an anime of a manga called Zombie Powder and if anyone knows what tht is your my new friend