Gekkan shoujo nozaki-kun
Last Game
http://www.mangago.me/read-manga/dont_cry_girl/
I read it recently, it's not a horrible read
Kamisama Hajimemashita. It's literally got all the genres I would enjoy. Fantasy, action, shoujo, comedy, and supernatural. And the manga/anime was executed well.
Basara.
And I'm not actually sure if they are shoujo but if they are then Natsume yuujinchou and Chouka kou (Tags say yes, but it's probably more like josei or seinen)
Chang Ge Xing (AKA. Song of the Long March)
Hands down ore monogatari
I really don't know if this classifies as shoujo but it's the first and best manga that pops into my head with straight couples.
http://www.mangago.me/read-manga/boku_no_hatsukoi_wo_kimi_ni_sasagu/
best shoujo manga you ever read??'