Armada JJ or LINE mr. Pollard opus?

Hi people on NS I narrow it Down to These to skis but i dont know which one. and dont know if i Can take it a length up. Im 170 cm and My weight is 65 a 66 kg. At first i can't decide if i should go With the armada JJ or opus. I wanna ride pow as Much as possible and wanna learn to jib and butter and throwing 360 around in the pow where ever there is pow. So i need your opinion on which one would be Best at it and what length would be Best for me. Im thinking jj 175 and opus 178 and Then im abit scared i Will regret it because of not enough flotation and Then maybe They get to long when trying to throw tricks around. So what do you wise people Think? And what Mount point should i use on both skis? Im thinking on the jj -3 from center and on the opus -2 from center? And would it be stupid to use a salomon Guardian 16 binding on or should i just use a normal salomon sth 16 binding or what are your opinions? Hope you Can help. And just Looking forward for a awesome season!