Well i dont want to give you a long list which you end of by giving you a headache,so here's a short list of some of my personal fav's that fit in with your criteria ^^
Eureka 7
Onegai Teacher (theres a sequel called "onegai twins",but it's not as exciting)
Romeo x Juliet
Shingetsuhan Tsukihime
Kimi ga nozomu eien
Utawarerumono |