try some of Malcolm Gladwell's books. they arent fiction but they are great time wasters that also make you think.

start with tipping point, then outliers is pretty good, what the dog saw is a collection of his New Yorker peices, and blink is a little bit harder to read and more conceptual than the others. but i enjoyed them thoroughly.

Night Angel Trilogy - Brent Weeks
The Wheel of Time - Robert Jordan
the Night Elf Trilogy - R.A Salvatore
The Dresden Files - Jim Butcher

Try out Eoin Colfer's book like Airman, Artemis Fowl.
You can also try out The Secrets of the Immortal : Nicholas Flamel by Michael Scott if you're into Mythology.