All I have to add is, don't believe certain stereotypes about anime and manga.
Shoujo isn't just for girls, and Shounen isn't just for guys.
I read alot of both, so I know this.
As for you YYH personally, I am not sure.
Most the girls I know that like it love it for the character development, and how alot of the characters interact with each other.
Hiei and Kurama especially.
Still, I gotta say, I'd be worth going back to school if I could be in a class where the Teacher had manga. That'd probably made my memories of school alot more fun. Still, I think its a great idea that children are starting to enjoy reading, by using manga. This'll lead them onto other stuff, and thats a good thing.
Alot of younger kids these days hate reading. Alot of children like visual stuff, so manga is a perfect combination for them.
I'd like to recommend that you use your budget to get alot of different and diverse manga into the class, and then ask the kids which they like the most, and increase the numbers of the ones they enjoy.
Hopefully, with luck, the kids will start to enjoy them so much, they'll start buying them for themselves, and will enjoy reading them.