Well, lets see then.....
Girl Got Game: Basketball may seem like the main focus of this manga, but its a shojo so its got a cute little love story wrapped up in it. I thought it was hilarious to read. Cross dressing is kind of the theme here. When the main character's dad enrolls her in the school, he enrolls her as a girl. He wants her to fulfill his dreams of being a NBA star. So there is where the story starts....
Imadoki: Short set, only 5 books long. Very cute, and well drawn. Lower class girl gets a scholarship to attend a very prestigious high school. She is teased relentlessly, but has one friend. They form the gardening society/club (Or something liek that...).
Hot Gimmick: Another great shojo title about a very odd love story. Heh...Its good, trust me :P
The Demon Ororon: Its only four volumes long. Please read it..please? The devil and an angel get together...what can be better than that :P
Wow, I really kinda suck at writing descriptions.....
Negima: Its hilarious. If you ever saw Love Hina you gotta read this one. Its a cute story, but has quite a bit of fan service. Just warning you ont hat one. I think its rated 16+ or something.
Psychic Academy: A future where there are psychics, AI the main character is a "late" bloomer. His talent doesn't come out until he is near high school age. But going to the psychic academy has its perks for him, his childhood friend goes there (Its a girl :P). There's a fair amount of fan service, but its a good story. Keeps you wanting to read more. Thus far it is 8 volumes in length.
PhD: Phantasy Degree: This is not your typical fantasy story. Its almost as if the demons are the good guys and the humans are the bad guys! They totally flipped the rolls. It has a good sense of humor and a pretty good plot thus far. (I've only read the 1st 3 volumes...)
Legal Drug: CLAMP. That's all I gotta say. I can see you're a CLAMP fan so you just have to read this one. And no, its not about getting messed up....no drugs of that nature. There is a hint of shonen-ai, but dont' let that bother you. The guys are just great to look at
Hikaru no Go!: For being about a boring game called GO, this really is quite the exciting manga. I have read 4 volumes of it and am eagerly awaiting to read more. Apparently this ran in Shonen Jump for quite some time (And still is...??) Lets say there's a ghost, a bit of love, competitions all over, and rivalry! YAY! Oh and some mystery!
Well, I don't feel like torturing you with more horrid descriptions. But if you wanna know more about any of those, or think those just suck and want me to list different ones...Let me know
Best of luck!!
Oh I also suggest picking up a copy of Shojo Beat....
And now that I look at your list again....it barely has any shojo in it at all...what am I don't suggesting all that shojo??!