I haven’t read much by Garth Nix, but I LOVE his Abhorsen trilogy. If you like high fantasy, adventure and coming of age tales, you might want to check them out.
Beyond the wall the dead can rise. Beyond the wall magic is possible. Beyond the wall great evil is stirring. Sabriel becomes the Abhorsen, who puts the dead back to where they need to go. Lirael lives with the Clayr (the seers) but has greater things in store for her. And in Abhorsen great battles are fought and prophecy’s fulfilled.
What is your favorite fantasy series? My other favorite would have to be the Belgariad by David Eddings. Such good stuff!