Can anyone give me some good shounen romance anime? anime for boys,,, with harem...

...or school life? 've already watched Dn angel, school rumble. Futakoi and futakoi alternative, Mahou sensei negima, Chrno crusade, Negima, Elemental gelade, Lovehina, Ah my goddess, Onegai sensei, Onegai twins, Inukami, Nagasarete Airantou, Hitohira, Tonagura, Zero no tsukaima, Da capo, Shakugan no shana, Saiunkoku monogatari, Ouran high school host club, Elfen lied
La Corda d'Oro, Yoake Mae Yori Ruri Iro Na, kaze kage mamoru and mamoru-kun shufuko wo ni megami.. Can you give me more anime or manga titles? Please Indicate if it's manga or anime ARIGATO GOZAIMAS DERU~!

I would recommend:
-school days(Anime; about 12-13 episodes)
-kimi-kiss~pour rouge(Anime; about 24-26 ep.)
-Clannad/Clannad after Story(Anime; about 24+24 ep.; "Clannad after..." is the sequel)
-Toradora (Anime; about 24 ep.)