The Expanse Series by James S.A. Corey (aka Daniel Abraham and Ty Frank)
- Leviathan Wakes
- Caliban's War
- Abaddon's Gate
David Weber's Honor Harrington Series (15 or 16 books)
David Drake's RCN series (9? books)
A. Bertram Chandler's John Grimes Saga (12+ books)
That should get you started, but if you need more
here's a reddit thread with a bunch more.
Edit: And
another really good list.