For character-driven SF, I've got to go with Mike Resnick.
Ivory and
Santiago would be at the top of this list, but the Penelope Bailey trilogy (
Soothsayer/Oracle/Prophet) and
The Dark Lady are good, too. Plenty of galaxy-spanning action, adventure & mystery, and nary a word of technobabble in the bunch.
And I think pretty much everything is available at Fictionwise (where you can read reviews, and the first chapter or so for free):
Ivory
Santiago
The Dark Lady
Soothsayer