[Funkduder]

I was thinking along the lines of the Night Angel Trilogy by Brent Weeks. He's a pretty good fantasy writer. (Medieval Assassins & Magic)
After which there are always classics like LotR and Wizard of Earthsea by Ursula K. Le Guin. (Classic Wizards)
Or for a more modern way, try the Dresden Files by Jim Butcher. That has around eleven books now, and is still going. (Mystery-Wizard Fantasy)