Replying to What size whould i get??

Ok i've decided to buy 4frnt STL's, mainly from all the positive feedback from the forum posts here. So heres my question. What size should i get them. the 147 or 167? I'm 5'6' (167cm) I'm 21 so im done growing. But i only weigh 130 lbs. (ya i know im a bit skinny.) And what would be the pro's and cons of both lengths? I normaly ski on 150's and have never really got into freeskiing until now. I could also use some ideas on what kind of bindings i should get and boots. Thanks