I like the one that will actually get built. Design isn't going to be nearly as important as sustainable funding, and that is going to take a new kind of business model. Any station will be a platform for science and a hot spot destination for rich people who can afford a trip. The money from rich people isn't going to cut it, just like first class airline tickets cannot fund an entire flight. So it'll be research projects that fund it. NASA will probably offer some cash for ongoing research, DoD as well. But will that be enough to justify the effort? Is that actually profitable? They'll need to go farther. They will need to sell research time to universities and private companies. And they'll need to have an entire human spaceflight support system. And they'll have to build and maintain this thing. And, and, and, and.

The economics of this idea are really tough, and flashy PR visions of potential designs exist for one reason - fundraising. They want to get people excited about what could be, get early investors to chuck in some money to start funding an enormously expensive project with very questionable return, just in terms of raw profit. The scientific return would be amazing, but science doesn't pay people's salaries.

So, I'll start getting excited when someone has a viable business model and stuff starts getting built. Until then, these are just fantasies.

Exhibit A: Bigelow was screaming from the rooftops that his space station would be operational in short order...20 years ago.