If you liked the Saber Marionette J Again anime, the Anime-Planet community thinks you'd like:
Having failed to earn admission to a university, Hideki Motosuwa has moved to the big city, determined to study his hardest for next year's exams. However, an unusual distraction presents itself one unsuspecting day in the form of Chii, a robotic young girl that has been discarded in the trash. In a world where an increasing number of people turn to these 'persocoms' for company, the bonds and limits of human relationships are tested as flesh manages to fall in love with the machine itself...
SMJ Again and Chobits are very similar, because in each the protagonist has a cute girl who does everything for him; it's the dream of any guy, I must say!
Chobits doesn't have the action that SMJ Again has, but is still enjoyable and has a good story. Both series have a lot of humor. If you liked one, you'd like the other.
Kei Kusanagi is a shy teenage boy with no romantic experience whatsoever... until he finds out that his hot new teacher is actually an alien! In order to conceal her identity, the two are forced into a pretend marriage... but is it really a pretense, or are they actually falling in love?
SMJ Again and Onegai Teacher are about the same sort of thing: in OT a beautiful teacher has to marry a young boy, and in SMJ Again there are three girls that want to marry the boy. OT has a lot of humor, just like SMJ Again, and has sci-fi elements as well. If you liked one, you'd probably love the other.