Baen recently started re-releasing works by an author in omnibus form that I had only slightly heard of, but never read, A. Bertram Chandler.
But really good stuff. Somewhat between Space Opera and serious SF and I guess even military fiction, since it's centered around the career of someone in the service.
http://www.webscription.net/p-1319-t...actic-rim.aspx
They seem to have a lot of his other works, but the omnibus releases seem to be coming 6 months part (there was one last month, and another one this summer)