I agree with Sparrow, going by your list of books you liked. The Magician by Feist (sometimes broken into two books by whoever first published it (The Magician: Apprentice and The Magician: Master) which is itself (themselves?) part of a three (or four) book series. But I don't think it's ebook'd... Lots of authors best works, their backlist aren't published.
Equally good and it is ebook'd is The Dragonbone Chair by Tad Williams. Book one of a four book series (the others are Stone of Farewell, To Green Angel Tower book 1, and TGAT book 2).
Other recommendations from a previous thread are found
here. Just remember a lot of those in this thread aren't ebook'd or more annoyingly, one seemingly at random book from a series is published but not all or even the first of a series (David Eddings' The Belgariad)