Well if you want some fun stuff I'd suggest The Honor Harrington series by David Weber, along with the rest of the stuff. Especially the Worlds of Honor and More Than Honor stuff.
Edit: The first volume in the Honor Harrington series is On Basilisk Station.
Another fun one is Ringworld and the whole Known Space series by Larry Niven, infact the stuff done by him and Jerry Pournelle is good. In particular if you can get a copy get Larry Niven's book of short stories called N-Space, they can be a bit grim but they're just fascinating.
Edit: The first volume in the Honor Harrington series is On Basilisk Station.
Another fun one is Ringworld and the whole Known Space series by Larry Niven, infact the stuff done by him and Jerry Pournelle is good. In particular if you can get a copy get Larry Niven's book of short stories called N-Space, they can be a bit grim but they're just fascinating.