1. Harry Potter series
Seriously. I know they're everyone's favorite books...but its because they're AWESOME. I could probably spend like 3 days just talking about all the ways these books are wonderful and all the reasons I love them. If you haven't read them...you're stupid. If you have, then you understand.
2. Anne of Green Gables series
Such gorgeous books. Anne was my first book love, and she continues her reign at the top. I love her so much. I read these books over and over again and love them just as much every single time. Also, don't tell Fiona, but Anne could kick Cassandra's (from I Capture the Castle) boo-tay.
3. Outlander by Diana Gabaldon
A beautiful love story with a fast-paced and interesting historical fiction plot. I think this book has something for everyone, and it is one of my favorite books to push on unsuspecting victims. Of course the series is still continuing and is now ridiculously long...who cares. This one stands alone pretty well, you don't have to commit yourself to all 5 years of Outlander series reading time at once.
4. North and South by Elizabeth Gaskell
I list this in my top 5 because A) I need a classic in here so I don't look like a dummy B) I like it better than Pride and Prejudice and I love telling people about how Mr. Thornton could take Mr. Darcy in a sexy hero competition any day (bring it on!) and C) it just really is darn good.
5. A 3-way fantasy tie between The Name of the Wind by Patrick Rothfuss, the first 3 books in the Kushiel trilogy by Jacqueline Carey and the Mistborn trilogy by Brandon Sanderson
They are all fantastic, brilliant, and epic. They're all monumentally different from each other. I have a gargantuan author crush on Patrick Rothfuss (ask anyone), the Kushiel trilogy is radically different then anything else I've ever read, and Brandon Sanderson has already pretty much set himself up as an all time great epic fantasy author.
I have read so much good stuff in the past year though...I always want to add them to the list. The Hunger Games by Suzanne Collins, Graceling by Kristin Cashore, Soulless by Gail Carriger, and Halfway to the Grave by Jeaniene Frost all get Honorable Mentions.