I really like Arkadia.  Open skies as far as the eye can see, literally, are only one thing going for it.  There are handfuls of planetoids, mostly man-made that pass for cities, and smaller moonlets and asteroids scattered throughout the ring.  You can live anywhere you want.  The gases that make up the ring aren’t exactly Earth-normal atmosphere, but humans can breath there just fine.  Gravity is the tricky bit, but that is what gravity generators are for.