Tom Robbins (the most colorful writer alive, his plots are always quirky and amazingly imaginative)

John Irving (this guy consistently writes great, sincere and spiritual novels)

Tom Wolfe (Charlotte Simmons, though flawed, was still one hell of an epic in my opinion)

TC Boyle (He is the most underrated writer alive ... check out books like the Tortilla Curtain, Road to Wellville, or anything he's written, they're all wildly captivating, original and entertaining)

Toni Morrison (duh)

Kurt Vonnegut (though he hasn't released a novel since 2000, he still puts stuff out, and is the greatest living writer imo)

Chuck Palahniuk (great writer ... hard to top when it comes to dark humor)

Alice Munroe (If you dig tortured and authentic stories about love and pain, she's hard to top)

Mark Z Danielewski (House of Leaves is the best novel of the last two decades imo, and though it's the only thing he's put out, I'm sure whatever he's working on now will be incredible)

Ray Bradbury (This guy is too often slept on. Everything I've read of his is mind-blowing).