I guess what I am really looking for is something enjoyable. One thing I do not like about some manga is that the mood stays the same too long. I seem to enjoy manga that can smoothly switch between action, comedy, and some romance because it manages to hold my interest by not focusing on just one of aspect of a story and the characters. I also like it when the mood shifts in a manga. It can be very annoying when a manga seems to be stuck in a constant state of happiness or depression. Having a good balance of the two makes a manga more appealing to me. However, I am open to anything that you would highly recommend.

Vague request begets eclectic suggestions...
Dear Mine
Gokusen
Family Compo
Karakuri Odette
Kanata Kara
Koukou Debut
Seigi no Mikata

You could try

Change 123
it does focus on the action more than the rest, but I still enjoy it.

Othello.
Hot Blooded Woman

I enjoyed both but I seem to remember them having a few darker parts.

and maybe
Kurohime
and
Zero-In