Something along the lines of the following mangas, and something LONG. Preferably completed.
A Fairytale For the Demon Lord
Beelzebub
Mushishi
Noblesse
Red Eyes
Sun-Ken Rock
The Breaker
Usogui
Zippy Ziggy

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There are times when you will miss what you never had. I wonder how you will find what you so desperately need.

A lot of genres/categories there... And no public lists. But here's a few that are completed:
Ga-Rei - 52 [long] chapters
Kurohime - 80 chapters
Shin Angyo Onshi - 75 chapters, manhwa

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"People don't change, they just give in."<BR><!--url_type_2--><a href='http://webtoons.com/en/fantasy/kubera/list?title_no=83' target='_blank'><u>Kubera is the best.</u></a><!--url_type_2_end--><BR>同人音楽 (doujin music)<BR><!--img--><img src='http://i.imgur.com/CkHPJMM.gif' border='0' alt='Laila Hemawati'><!--img_end-->

Apologies about that.

I've read all three - well, I've tried reading Kurohime, but I gave up halfway. Don't want to pick it up again.

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There are times when you will miss what you never had. I wonder how you will find what you so desperately need.

Zetman
Angel Densetsu complete
Elfen Lied complete
Kurozuka complete
Ares complete
Berserk
Claymore complete
Ubel Blatt
Vinland Saga

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What I like in Trivial Pursuit style. Pick your category:

wrong, it is NOT completed this is a false information
good though...

you can also try
Pandora Hearts

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in need of romance?
uncommon, sad, sweet

It's sad not to pick up Kurohime. Why ?

Thanks for the recommendations; I loved Zetman, and am starting Claymore and Kurozuka.
I've tried Pandora Hearts, but I didn't like it that much. And I've already read Ares, Ubel Blatt and Elfen Lied. The art of Angel Densetsu used to turn me off, but I'll try it this time around. Vinland Saga doesn't work for me, as I like supernatural elements in my action-oriented mangas. Berserk is an awesome series, but I'll wait a few years before I touch that. I like sleeping, you know.
@MisaoFan - because that story made as much sense as international politics.

________________
There are times when you will miss what you never had. I wonder how you will find what you so desperately need.

Any other suggestions, guys? I've read all that I liked in the above

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There are times when you will miss what you never had. I wonder how you will find what you so desperately need.

D.Gray-man? but I guess you already read this one...
Cage of Eden is fine too, but you have to endure much ecchi...

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in need of romance?
uncommon, sad, sweet

Yep, read D.Gray-man. And I'm not much of a fan of the Survival theme :/

________________
There are times when you will miss what you never had. I wonder how you will find what you so desperately need.

hmmm...
Yumekui Merry but not that long
Kaitai Shinsho Zero translation has since a while ago
Hoshi no Samidare not that long, completed
Immortal Rain same as above, completed
Superior and Superior Cross together should be long enough, completed
Hellsing completed
Rurouni Kenshin & Samurai Deeper Kyo both completed, the frist one is like the funny version of the other

that's it for long ones I could recommend here...

________________
in need of romance?
uncommon, sad, sweet