Replying to Does the waist width of the ski make a big difference?

Alright guys here my problem im an advanced begginer/ intermediate park skiier that is used to using skis with a 78mm waist.  Now i can get a really good deal on a pair of 170cm SURFACE WATCH LIFE skis ($260) - (without bidings) these skis are brand new and have never been mounted.  Buuut the dimensions are 118/90/112. Will this 90mm waist make a big make in my ability to ski. Also if any one knows anything about these ski let me hear it, good or bad!

And the other skis I could get are NORDICA SUPERCHARGER IGNITION skis (170's) These skis are used and have some surface scratches and some scratches on the bottoms ( that may or may not be significant). Their dimensions are 122/84/118. I could get these skis from Toronto for $250 with MARKER 12 FREE bindings.

Also i am 15,  6'4'' and weigh 190 pounds.

WHICH SKIS SHOULD I GO WITH FOR MY NEEDS?