The Corvo shall keep him alive the best, in my oppinion. I once passed with it through the Nomad systems in early morning hours, when there was not much players online, so the NPCs were plentifull. I had a Cap4 armor on it, and, if I recall correctly, an anti fighter load out, mostly. perhaps a battlerazor or two.
On the other hand, regarding combat capability, the Zoner Destroyer, the Fearless, would be a much more potent vessel.
With Freelancer ID, you could use the Kusari explorer. My SP test has shown that it can fire three gunboat missiles at the same time. If that has not been changed since the betas, it should still be a powerfull ship.