Think anlave is the nearest "has everything" system
you find those by going to galaxy map, setting view options to economy, deselect everything but hi tech, then, for size options, select "by population", and slid the min bar up to 1/3, and slowly slid the max bar down to 2/3
Doing this looks for the highest population hitech system, as you slid the max meter down, you want to scroll around and look for the blue dots that stay large the longest. those are the gear goldmines.