I don't have a lot of manga and haven't read much...
But I have read some of Love Hina, Kodocha, Marmalade Boy, And I tried reading Great Teacher Onizuka but I couldn't get very far in it...
Oh, and I think I read some of Mars too...
Before that, I bought Evengelion (3 issues, not the TPB) and Nadesico and Pokemon, oh and i bought a few issues of Sailormoon and go a Sailromoon SuperS TPB. I threw all of them away, but I really shouldn't have...
In any case, I only own 1 manga now, it's Kodocha TPB 1. kodocha is a great series, and it can get extremely silly, but it's also very emotional. It's one of the best anime I'd ever seen (even though the anime was much crazier than the Manga) and I loved the Manga. I want to start getting more copies.
Another Manga I started to get into was Marmalade Boy. I really got into it, and I was upset when I had to stop reading it when I came home. That is a great story.
Well, in any case if you have read either of these manga, we can talk about them...