everything from Terry Pratchett except for the first 23 discworld novels (I have read them already and have them at home)
Jonathan Stroud - Bartimäus book
two and
threeTrudi Canavan -
The Novice and
The High LordIan Irvine - The Well or Echoes tetralogy (last time I checked it was only a trilogy...)
There are many more books that I want to read, more than I can think of at the moment.
These are the books I will buy for sure, because I read other books from their authors (e.g. the first book of Bartimäus) and loved it.