I am looking for books for my nephew for christmas. He just finished the naria series but needs something new - can anyone suggest a good series that is christian based?

there are tons out there now...

If he likes fantasy...

Landon Snow series by RK Mortenson

Kingdom series by Chuck Black

The Doors Within Trilogy by Wayne Thomas Batson

Dragons in our Midst series by Bryan Davis

Dragonkeeper series by Donita K Paul

Forbidden Doors series by Bill Myers

Echoes of the Edge series by Bryan Davis

Shadowside Trilogy by Robert Elmer

In addition to the series already mentioned in the post above:

Isle of Swords by Thomas Wayne Batson

Isle of Fire by Thomas Wayne Batson

Viking Quest Series by Lois Walfrid Johnson

The one that pops to mind that hasn't been mentioned is The Sword of Lyric series by Sharon Hinck.  I can second almost everything Deborah mentioned though :-)  If I knew his age I could pinpoint it better.

you might check out focus on the family. they have some pretty good suggestions.

Robert Liparulo has a new series out. the first 2 books have been released, and the third comes out the end of dec and the fourth comes out next july. its called Dreamhouse Kings