some I would suggest are already on your list (Chilling Romance, Lovely Complex, High School Debut)
He Was Cool (cute, light, and super young Song Seung Hun)
How to Date an Otaku girl (if you're ok with the female lead being obsessed with yaoi)
Kimi Ni Todki (sort of like Nobuta wo Produce)
Hana Yori Dango 1995 (fashion is hilarious and it was a pretty good adaptation)