I like
Annemarie better. I'm not really all into
Maria. But you could always go with
Ana Maria.
Ana Maria is a little popular though (I know a few girls name it, but they are all 12-15 so I don't know the current popularity).
As for
Annemarie. I don't think it would get mispelled a lot. I grew up with a girl named
Annemarie and she rarely ever got it mispelled. She would occasionally get
Annmarie or Annemary, but that's about it.
Anyway,
Maria is
very popular. It ranked 47 in '06.
Annemarie hasn't ranked anything in since the 1990 (and even then it was in the 900s)