SR1: Finding better engines?

[Voyager]

So I'm just starting up on Space Rangers 1, and I'm finding I would like better engines. I found a basic version of the phase drive, with the 450 speed, and 24 parsec jump limit.

What sort of places should I look for to find better engines than that, and what conditions start them spawning? At the moment, I seem to be doing reasonably well this time; I'm earning about 2k a courier mission, and this map is laid out so I can reach most of the systems with 1-2 jumps through safe space, but there doesn't seem to be much to buy with it at the moment that is much better than the starter stuff.

Harry Voyager