Magician

If you really like Magician, try Feist's other novels of Midkemia. All of them are set in the same world, though most of them fail to match Magician. The one exception is his The Empire Trilogy, coauthored with Janny Wurts. The Empire Trilogy is a fantastic read, and I whole heartedly recommend it; the quality of the prose (perhaps due to Wurt's influence) is far superior to Magician.

If you are really desperate to read more about Feist's characters and world, then you can read his 20+ other books set in Midkemia of which many of the main characters from the original Riftwar Saga pop up again and again, sometimes as main characters, sometimes as side characters, and sometimes as cameos. 

However, the only books really worth your time are Feist's original Riftwar Saga books (and of those, the first two, Magican: Apprentice and Magician: Master are the best) and The Empire Trilogy written with Wurst. The rest of the other 20-30 books are meh (some better than others, some horrid, some approach decent, but mostly mediocre)

Feist's books always emphasize the heavy use of magic (some might say over the top use of magic) and loads of political tensions. If you like Feist's style of storytelling and his use of heavy magic, read Robert Jordan's The Wheel of Time. Jordan's books are rampant with magic use.

Also give Margaret Weis and Tracy Hickman's The Death Gate Cycle a whirl. it's a good story (better than anything else they've written) with lot's of tension, lots of mystery, and lot's of powerful magic in the vein of Jordan and Feist. Hickman and Weis are responsible for populating the fantasy genre with the worst sort of fantasy tripe (Dragonlance), but surprisingly, their Death Gate Cycle is a much much better effort -- the best of their work and likely will stay that way.

Also read the The Runelords series by David Farland. Same style of writing as Feist (lots of magic, lots of powerful characters, lots of action, not that much characterization), but with a more interesting magic system. The problem with Feist is that he tends to make his character's too powerful and Feist is forced to find ridiculous ways of handicapping them.

And for another epic fantasy series with some sweet magic, an awesome hero, huge world building, and some kick ass action scenes, read Brandon Sanderson's The Way of Kings.

Also give Brent Weeks new series The Lightbringer a read. It's action packed, has lots of magic, lots of mayhem, and is essentially a coming of age story -- all the elements that make Feist's Magician books fun reads.

And of course, how can you go wrong with some traditional sword & sorcery from Robert E. Howard's Conan The Barbarian. These are the tales that started the entire Sword & Sorcery genre and influenced writers like Robert Jordan AND Raymond E. Feist. 

See our Best Sword and Sorcery list for more recommendations.