Ender's Game series is one of the best out there. Have you read the latest Bean book with his children on the ship?
The Shadow series (ender's shadow, shadow of the hegemon, shadow of the giant) follows Bean and is a really cool perspective on the storyline.
I've read Ender's Shadow, which I felt was the better story between Ender's Game and Shadow. Didn't realize that Shadow of the Hegemon and Shadow of the Giant also followed along from Bean's perspective.