Replying to Powder ski sizing

My height is 5'7 1/2, I currently ride a 176 Armada B-Dog for park/all mtn so I am used to riding larger skis for my size. I have been looking at the Armada JJ Zero for powder and can say that they would be the ideal ski my type of skiing. However they come in sizes 175 and 185, nothing in between. 185 seems huge but something puts me off from having a pow ski the same length as my park skis. Any advice would be greatly appreciated!