[dragonwriter]

I mostly agree with what you say, but ballroom is also a good choice -- its true that social dances usually are held at studios, but they often draw a broader crowd than dances at the same studio, and if you are in a place with an even half-decent ballroom scene, you can find multiple studios besides the one you take classes at (assuming you only take classes at one) for social dancing, so you can get quite a bit of variety.