A few additional thoughts based on the comments here:

If you liked "In Conquest Born" - Friedman wrote These Alien Shores, which is a true hacker sci fi, absolutely incredible.

The Book of Skaith by Leigh Bracket is a truely awesome compilation of the three Skaith novels. Leigh helped write the initial Empire Strikes back!

Almost anything by Jack Vance will be good. If you've read The Dying Earth, George RR Martin just produced a tribute called Songs of the Dying Earth with some of the best Sci Fi writers contributing.