[Question] In need of quality manga series

[Supermacaquecool]

Hoshi no samidare!
You gotta read that one: here's a review I did on it (spoiler free):

You must be registered for see links

 

[EveryThingAnime]

I'm really going to push One Piece. I'm guessing you didn't get far... :/ Take your time and don't RUSH. The series takes a while to get into.
Anyway, time for my other suggestions:
Hangyaku no Kage Tsukai (Pretty decent.)
Vagabond (You can buy this too. The Vizbig editions are great in terms of quality. The art/story is amazing.)
One Punch-Man (Eh, the story is okay. I just started it today. The art is amazing)
Area D ( not for everyone. It has a Deadman Wonderland feel to it. Check it out)
Blue Exorcist (It's a typical shonen...but it is well done)
The Seven Deadly sins (I highly recommend this one)
Shinmai Maou no Testament (A lot of ecchi...so if you don't like that stuff, don't read this manga)
Sundome (Um, well, try it out for yourself.)
The Flowers of Evil (Amzing Manga)
20th Century Boys (Don't have much to say. It's a masterpiece, IMO)
Btooom! (Amazing Manga...)

 

[Third Sage]

Wow, didn't expect so many replies and suggestions. =D Thank you all! I'll take some time this afternoon to look into all these mangas and decide which one I'll start to read.