I like the Pleiades, since it's a launching place for other nebula to encourage exploration. As for a purpose, it would be a station that prepares ships for exploration. That's the main gist of the idea, right? ...the beauty of a station in a nebula backdrop, and to encourage more people to enjoy the exploration aspect of the game. Therefore, outfitting could have the best equipment for exploring. Carry weapons to defend yourself until you get here; then dump them for AFMUs and head out to see the other nebulae, tour map in hand. The station can maybe sustain itself if there are earthlikes nearby with agriculture that would have their own stations. Perhaps 3 stations within 50 LY of each other--the high tech exploration outfitter, the agriculture food supplier, and the refinery/mining ore and metal supplier--if such planets exist in that configuration out there. As for which power would control it, or if control is in dispute, I haven't a clue--whatever lore can work to still encourage exploration gameplay.