wanna know too
Love at first Site
http://www.mangago.zone/read-manga/ouran_high_school_host_club/ -kinda
http://www.mangago.zone/read-manga/seishun_otome_banchou/ -I don't know if its love at first sight
Popular/Unpopular
http://www.mangago.zone/read-manga/kimi_ni_todoke/
http://www.mangago.zone/read-manga/perfect_girl_evolution/
http://www.mangago.zone/read-manga/say_i_love_you/
http://www.mangago.zone/read-manga/horimiya/ -Kinda
http://www.mangago.zone/read-manga/kaichou_wa_maid_sama/
http://www.mangago.zone/read-manga/nousatsu_rock_star/
http://www.mangago.zone/read-manga/nil_no_koi_mahoujin/ -Maybe
http://www.mangago.zone/read-manga/princess_tutu/
http://www.mangago.zone/read-manga/koe_no_katachi/
http://www.mangago.zone/read-manga/nousatsu_rock_shounen/
Got them all from this List
http://www.mangago.zone/home/mangalist/12695/?filter=&page=1
*Sorry didn't read the question clear enough not all of them have just a popular guy going after the unpopular girl
Also the second manga for love at first sight (Seishun Otome Banchou) should be in the second list (popular/unpopular)
Are there any Shoujo manga out there that is like Beauty Pop? ( http://www.mangago.zone/read-manga/beauty_pop)
In the fact that it's the popular guys going after the unpopular girl? or it's not 'love at first sight' or 'What is this feeling? I LOVE HIM!', you don't know that they like each other until later?
(This is also the reason why Beauty and the Beast is my favorite Disney movie, they actually fall in love and it's not with a prince but a beast)