For the Old Man's War flavor, I recently finished Neal Asher's Agent Cormac series, which is a subset of his Polity series. The stories are stellar, excellent character development, and deliciously complex moral issues. I'd say it's interstellar James Bond (Daniel Craig's version) having a love child with The Culture, early Tom Clancy, and "Heart of Darkness." My one caution is that Asher's sentence structure sometimes almost feels like reading Thackeray.

I am now going back and reading the rest of the Polity novels in order. I am quite pleased. I kinda wish I started from the beginning, but it's also been fun to have that "foresight" on events now that I'm in the earlier novels.