Don't forget Weber (Score 1)

David Weber's Honor Harrington series is good for the 13yg crowd, It's Horatio Hornblower in space, with a Female protagonist. Elizabeth Moon's stuff is great too. Keith Laumer is good, but scan it first, some stuff is pretty far out there. Some mike resnick anthologies, and the first 3 Callahan's novels by Spider Robinson (last 2 get a little mature)