I like a good Space Opera. Have you tried the Miles Vorkosigan books by Lois McMaster Bujold? Elizabeth Moon's "Serrano Legacy" series is good too, but her other stuff leaves a lot to be desired. Robert Silverberg's Majipoor trilogy is enjoyable, as is much stuff written by Ben Bova - "Winds of Altair" is a favourite. Likewise Orson Scott Card's Ender Wiggins books, though they are more thought-provoking, especially once you get beyond "Ender's Game"
Fanfiction.net is a good resource for amateur stories written in various universes including Discworld. Admittedly a lot of it is mediocre, but there ARE some truly exceptional stories lurking among the drivel. There's something there to suit all tastes, and new material is always being posted.