I haven't read the previous posts but I will give you my top 5 reads:

1. Memoirs of a Geisha by Arther Golden - this is such a beautiful and intriguing story
2. Harry Potter Series (looks like you've already got to these!)
3. The Tomorrow Series by John Marsden - this is supposed to be teenage fiction but it is a brilliant series, I felt like I was there with a characters. The story over the 7 books is brilliant and hard to put down!
4. A Boy Called 'It" by Dave Pelzer - this is so sad but it's a true story of triumph over evil.
5. Trading Up by Candace Bushnell (author of Sex and the City) - this is such a funny read!!

Oh one more - The Notebook by Nicholas Sparks - absolute tear jerker!!