So I was comparing your list with mine and here's what I think you should see:
(I marked the ones where the main plot is romance *)
- Air and Clannad (the movies - YES they are different) *
- ef tale of memories (prepare the tissue box) *
- Victorian Romance Emma (I dunno if it will be your kind of anime, though I LOVE it and you have some train scenes ;p) *
- Hanasaku Iroha (you never watched this one? whoa go go go! AND TRAIN SCENES!)
- Higashi no Eden
- Junjou Romantica (AHAH just joking lol) ** (ahah)
- Kimi Kiss Pure Rouge *
- La Corda D'Oro (I really love this one, I've always wanted to edit with this one but never found the dvd's/raws

but it's so awesome!)
- Macross Frontier (it says you never saw it and somehow I think MAL is trolling me now)
- Nodame Cantabile (OMG YOU WILL LOVE THIS ONE! A MUST WATCH!) *
- Ouran Host Club (we already talked about this one so ;__; it's your call)
- Romeo x Juliet (.... seriously? ^^') *
- Princess Tutu (follow Phil's example and go watch it!) *
- Rurouni Kenshin (we talked about this one too.... first series then OVAs!)
- Skip Beat! (FAVORITE!) *
- School Days (omg for the jokes, watch this LOL) *
- Shugo Chara (this one is really long but well for Amu and Ikuto is totally worth it)
- Winter Sonata (it's korean but so worth it... another one I can't find the DVDs or raws

) *