The Honor Harrington series is a good one. David Weber is the only writer for the main book series (12 published so far). Though, he has let other writers into the sub-series and short-story anthologies.
I'd put these high on the list as well. However, after the last couple of books, I think Weber needs a stronger editor.
Out of the Dark (Weber's most recent non-Honorverse book) certainly wasn't up-to-par. I wonder how much a writer's status impacts the writer/editor relationship. It must be hard getting some of the more famous writers to do re-writes.