So when creating a responsive design, how big should the maximum width of the container be?

- Should the maximum width of a webpage be fixed ([`width: 100%; max-width: 1200px`](http://jsfiddle.net/Lvcxg/))?
- Should it grow slower after the last breakpoint ([`width: 100%; max-width: calc(600px + 40%)`](http://jsfiddle.net/Lvcxg/1/))?
- Or should it go full-width, always ([`width: 100%`](http://jsfiddle.net/Lvcxg/2/))?