I recommend Stephen Donaldson (
http://stephendonaldson.com):
The Chronicles of Thomas Covenant the Unbeliever- Lord Foul's Bane
- The Illearth War
- The Power That Preserves
The Second Chronicles of Thomas Covenant the Unbeliever- The Wounded Land
- The One Tree
- White Gold Wielder
These are very much fantasy (other world with magic) based but I love the fact that his central character (from our world) isn't really a nice guy and continually denies the existence of "The Land" in which he ends up (hence why he's the Unbeliever).
He's also done a futuristic sci-fi series called The Gap Sequence which I loved - once again the main characters have many flaws but the story threads are woven into a magnificent tapestry of cause and effect that makes you think, after you've finished, that you should have been able to see it all coming and made me go back and read it again.
The Gap Sequence books are- The Gap into Conflict: The Real Story
- The Gap into Vision: Forbidden Knowledge
- The Gap into Power: A Dark and Hungry God Arises
- The Gap into Madness: Chaos and Order
- The Gap into Ruin: This Day All Gods Die
There is more in a similar vein but I don't want to sound like a Stephen Donaldson evangelist. I will, however, second Peter F Hamilton as a recommendation from someone earlier in this thread - his Night's Dawn Trilogy is marvellous sci-fi as are all the other books of his that I've read (see
http://peterfhamilton.co.uk).
I own all these books in paperback or hardback and haven't looked at eBook availability yet....
Cheers,
Terry.