Just get the Evo. The Evo isn't a "park board". To me, it's a lot like the Blacklist or Westmark. You can take that thing anywhere on the mountain, and it works great in the park. But because the contruction, and the edge tech, the board can ride anywhere, and doesn't experience huge downfalls on those non-powder days. Great board.
I consider the Proto to be more of a jump board. But wouldn't use it in the park for much more than that.