Oh, I don't know where to start.
1. HBP, this book is just down right beautiful. It's so amazing it brings me to tears. JK Rowling outdid herself here.
2. GOF, this one is a classic. He has everything from romance to action.
3. POA, I find this one very amusing and fun. Remus Lupin rocks this book!
4. COS, I adore this book, and the ending is just so cute.
5. PS, I like this book because everything was fun then and not so serious.
6. Ootp, I didn't like this book at all, I hardly read it. It's the only Harry Potter book i haven't read a thousand times.