I'm not sure a fully realistic, or "hard science", space war would work in our solar system, not in a heroic fashion. After some thought I figure such a war would be done in a manner similar to the submarines warfare of World War II. Space is vast and ridiculously easy to hide in. Ships would likely have numerous stealth systems to reduce the radar profiles and heat sinks to reduce their thermal signatures. It would be a game of cat and mouse around significant facilities spread throughout the solar system.

Further, if I were to build my own ship for fighting in space it would involve all my weapons systems being satellites. It would ensure that if my weapons, the most likely to be detected via their projectiles being traced back to source, are attacked and not my people. They'd also need no life support systems, radiation shielding or other systems to provide additional mass. The command ship would control these via tight beam laser transmission. Depending on enemy technology I'd probably throw in interceptor and attack fighter craft, mostly for scouting and scout interception, unmanned so that they could do make G-Turns that would turn a human into paste.