Raymond Feist Magician Series.. spans like 30 books total if you want the whole series.. or just the first 4 are fine.
http://www.amazon.com/Magician-Appre...=raymond+feist
Wheel of Time by Robert Jordon
http://www.amazon.com/Eye-World-Whee...=wheel+of+time
Codex Alera (roman themed, magic with elementals)
http://www.amazon.com/Furies-Caldero...er+codex+alera
Seventh sword series (one of my all time favorites)
http://www.amazon.com/Furies-Caldero...er+codex+alera