If you want mountainous and affluent near Denver, the first thing that comes to mind is Aspen or Vail. Depending on the time of year/weather, they're about an hour's drive away. Centennial is nice, but it's not the first thing that comes to mind if you want "hilly".

I don't live there, mind you. I've only visited so maybe my memory is skewed.

Lois: You know, I have a funny feeling that you didn't tell me your biggest secret.

Clark: Well, just to put your little mind at ease, Lois, you're right.
Ides of Metropolis