I have voted for 3 books.
Game of Thrones: As stated before this is straight up fantasy. This is probably my favorite fantasy tale I have ever read, bar none. The world is rich, dynamic & complicated. The characters are diverse & richly written & fully brought to life. Their reactions are “real” there is no true good, there is no true evil, there is only people & their reactions to it. Full of magic, intrigue, romance, murder & mayhem. The only drawback I see to this series is the amount of time he takes to write them & the ever expanding end point. I for one have been closely watching his website for any word on the next book.
Dark Force Rising: A cintinuation of Heir which is the current read. Excellent book & a great second act for the trilogy.
Mort: I have never read Pratchett & so many people tell me I need to. This would be a great excuse to get off my butt & do it.