You should seriously consider the Parkzone Slo-V. It's like a giant Ember 2 but it doesn't fly a whole lot faster or require much more space. The 4' wingspan will allow it to fly in a breeze that would make flying a Champ or Ember 2 impossible, however.

There used to be video of the Slo-V flying inside of a basketball court on the Parkzone web site, but I'm not sure it's still there.

[youtube]http://www.youtube.com/watch?v=l1QrSXrr17s[/youtube]