I got burned out on Honor after "At All Costs" but I really enjoy them. "on Basilisk Station" is a brilliant novel, but my favorite is "Honor of the Queen". I prefer her as a Captain rather than after her promotions.
If you can, track down the short novella "Ms. Midshipwoman Harrington". It's really good, and it shows Honor with her first tour.
I have a Honorverse wargame called Saganami Island Tactical Simulator, but I'm not smart enough to understand it. It uses vectors and equations and stacking blocks for elevations. It makes Star Fleet Battles look like Monopoly.