The Easy Livin is a sick park board that will do good in powder, but for all-mountain you have better options. If you want to stick with Burton, the Custom Flying-V or Sherlock seems more up your alley. Also take a look at the Joystick. All three of those boards are better all-mountain and powder boards.
Also, it's hard to recommend a size if you don't provide your weight, boot size, and height. Weight and boot size play the most important roles in board sizing while height plays a bare minimum. Consult each board's spec sheet and look for a size where your weight falls in the center of the weight range.