Gabriel looks really close to what a full Delaney triangulation would look like (particularly towards the center). Took me a moment to realize it was not fully connected.
Definitely like the relative neighbor one too.
Edit, for Keith:
Awe man, I just had an Awesome idea. So when I was doing some map-gen stuff for that stealth game I have on the back burner, one of the things was having "backdoor" routes that created linkages from room to room that were less planned (it was a "pick two rooms that aren't connected, they can be anywhere, do a brute-force search towards the destination: if at any point you dead-end with no reasonable method of placing a further passage, terminate and consider that the linkage instead).
So. The idea I had for AIW2 was having some kind of building/capturable/hackable node that would act as a long-distance warp gate that would provide linkages between planets that doesn't use the galaxy map linkages. They'd be predetermined and fixed, go in one side, come out the other, just like a wormhole only they'd be backdoor-y.