Exterminator: And a BIG 'indeed' about I-War! I just have to share a reminiscence about I-War 1:
During the mandatory maneuver training-mission, you have to push your mostly newtonian 170'000-ton discus with thrusters and cockpit through a number of rings. You can ask the instructor 'What if I hit one?'. (His response is, incidentally: '... It will hurt.' Classic!)
I approve of your taste in random purchases. Like cff, I found DSO a fairly enjoyable middle-ground between Privateer and I-War - it might not rock your world, but it isn't bad. I don't know Dark Horizon at all. I found some bits of its soundtrack lying around on the net, and I was greatly impressed by it. Music, however, does not a great game make, mkay? Do report your findings, though.
It seems that it might be worthwhile to pickup Dark Star One, so I'll keep my eye out for it on my travels.
I quite liked I-War, it was a bit Linear but I enjoyed it, especially the mission where you placed space mines on the neutronium containers and then suckering the pirates into picking them up hehehe, After getting boarded no less and them chucking the crew out the airlock one by one!!
Anti Matter is pretty nasty stuff in that game too.
Edge of Chaos was more open ended to a certain degree, the pirating was pretty good, but most of the time I just seemed to pick up garbage, perhaps it was just me.