Then you might be fine with the ET, especially when it's that short. I just felt that the camber somehow tries to slam the board back down on the ground when buttering. But if you're used to buttering a stiffer board, give it a try.
Another thought: I know you said the shop only has a 152 but at your weight it might be too small for an all-mountain ride, at least in my opinion. I weigh the same as you and rode the 56wide. I wouldn't have gone smaller. But as always - it's personal preference.