Recommendations for children's chapter books?

So, I love to give books as gifts. I always have and I doubt that will ever change. But one of the children I like to give gifts to is at one of those ages. You know what I mean. She's still just a little thing (well actually not that little - she's TALL) but reads above a fourth grade level, which means finding the right books can be tricky. When kids read above their level content can be tricky. For example, she can read (and enjoys) the Junie B. Jones books but the Diary of a Wimpy Kid series isn't yet approved by her parents.

Young adult literature I'm good at. Younger than that and I struggle a bit. I have a few ideas floating around in my head and I'll totally be raiding the Cybils lists but I'd love to hear some of your suggestions.