I'd really like to read a shoujo or josei where the girl isn't searching for her first boyfriend in the beginning. She likes guys, is getting ready to start dating again after breaking up, etc. Some ex-boyfriend drama would be nice.

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And so Man Candy fell in love with Vampire Mermaid.

Pumpkin and Mayonnaise is great.

Maybe a little different, and it's not a 10/10 manga, but Kimi Shika Iranai is the 1st one I think of.

Tramps Like Us--probably already read this but if you haven't then you definetly should because Sumire is one of the strongest female leads out there. It also deals with that ex boyfriend drama a bit.

Kimi no Sei--yup she likes guys and has had a couple of boyfriends in the past. However the guy she dates during the manga, she is only using him for revenge cos he used to bully her during her childhood. The guy is totally in love with her and doesn't remember about those incidents It is really really good.

Chiro Star Project--she is forced to break up with her boyfriend by this dude who she owes a debt to. So lots of ex boyfriend drama here.

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Angel Beats--best anime of the 2010 spring season