What party of 4 (Edit: 6) would most showcase what 4e is?

[ThePurple]

In discussing this thought experiment with my wife last night, she said she'd like to include a Primal class, as it's a largely new power source for 4e, which got me thinking and reconsidering my options.

I always loved the idea of Wardens, even if the implementation isn't particularly optimized. They have an interesting niche between barbarians and druids, especially with their transformative dailies.