Some sort of serious josei or seinen romance i.e Mars, Paradise Kiss, Chocolat (Seinen), that I haven't read.

Nana.....doesn't seem like you've read it yet, made by the same person who made Paradise Kiss...but much better in my book, i'd go ahead and read it

[img]http://img40.imageshack.us/img40/4158/1205047355313.gif[/img]

try...
haru yo, koi
it has a serious tone for the most part, but it can also be light hearted at times. i really enjoyed it but it would be nice if they came out with more chapters[m]

"When god gives you lemons, find a new god."

Maybe Ciguatera....

Also Ai-Ren, but that's a bit tragic.

I'll update this if I remember more titles. (a bit knackered now)

Point & Squirt

Eternal Sabbath -> same mangaka of Mars
Kagen no Tsuki -> i'm not a fan of it tough (and for the content is more josei than shoujo imho)

and maybe D-Ash

What I like in Trivial Pursuit style. Pick your category:[img]http://i379.photobucket.com/albums/oo233/Reid4891/Manga/trivia-1.jpg[/img]

Kurosagi is a good one.

Listen here
Livin just to keep from dyin
[img]http://imagegen.last.fm/TheDarkTen/recenttracks/imgooley.gif[/img]

Basilisk
Body & Soul
Doll Garden
Forget-me-not
Hoshi no Koe
IO
It's Not Like That, Darling
Kamichu!
Le Portrait de Petite Cosette
Made in Heaven
Me-Teru no Kimochi
Ohikkoshi
Parallel
Tsuiteru Kanojo
Yuuhi Romance

source: animenewsnetwork

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