You may want to search for older threads on reading recommendations. There have been various great threads on this over the past year or so.
Here are a few tidbits:
Steven Erikson, The Malazan Book of the Fallen - three books are now out in a series scheduled for ten instalments, an epic, continents-spanning read with a cool magic system and lots of sub-plots.
I second the recommendation of Robin Hobb; this is another pseudonym for Megan Lindholm, but her Robin Hobb novels are in a much grittier and more atmospheric style, which I enjoy a lot.
Gene Wolfe - Book of the New Sun. A classic. Wolfe's worlds are just awesome. This tetralogy's main character is an executioner and torturer by trade (of all things!). If you like it, go on to read the Book of the Long Sun and the Book of the Short Sun trilogies, which are very loosely linked to the Book of the New Sun.
Guy Gavriel Kay - Tigana. He's written a few other fantasy novels, most with a strong alternate history touch (The Fionavar Tapestry is probably the most widely known), but Tigana is really his best work.
On a lighter note: Steven Brust - the Taltos novels. A hitman in a world dominated by bullying elves, where organised crime and hit contracts appear to not be particularly frowned upon, seeing that resurrection is available ... unless you've had the bad luck to have been killed with an illegal demonic blade. Written in a style much reminiscent of Thirties private eye novels and rather fun.