A series list is much easier/better

, and includes favourites
and best:
Amber - Roger Zelazny
Foundation - Isaac Asimov
The Black Company - Glen Cook
Dune - Frank Herbert
Cities In Flight - James Blish
Demon Princes - Jack Vance
Lensman - E. E. 'Doc' Smith
Urth Of The New Sun - Gene Wolfe
I know that's more than 5, and I could have gone on

, but I love all these books, with the possible exception of the first Foundation book.