Plus 1 on the Dark Tower series. Recently finished my 3rd re-read of them. Pretty much anything by King gets the thumbs up from me though.
Surprised nobody's mentioned Stephen Donaldson yet (I think... ) , his Chronicles of Thomas Covenant ( now waiting for book 4 of the 3rd chronicles, supposed to be out end of this year ) would be the best " fantasy" style series ever IMO, and if you want sci- fi he's got that covered in the Gap series; high Tech, high drama and some freakin awesome battle sequences, can't wait for someone ( are you listening Chris Nolan? ) to make the movies. His writing style takes a little bit to get used to ( need a dictionary on standby ) but once you get on the wavelength it's bloody hard to put his books down.
" Reave The Just " is a collection of short stories of his which is a good place to start on his books.
Ps. No I'm not his publicist ha ha just a fan...