Stephen R. Donaldson (Lord Foul's Bane, Second Chronicles of Thomas Covenant)
Robin Hobb (Assassin's Apprentice, Shaman's Crossing, Ship of Magic)
Brandon Sanderson (The Way of Kings, The Wheel of Time)
David Gemmell (Lord of the Silver Bow, Shield of Thunder)
Philippa Gregory (White Queen, The Virgin's Lover)
Or ask a librarian for other suggestions!