Replying to Buying Line skis HELP PLZ

Hey yall,

need a new park/all mtn ski.

I'm 5'11", 200lbs, did 75% straight park days last season, have a pair of 181cm atomic access with F12s for pow days, intermediate but aggressive on rails, like big air, blah blah, current park ski 2006 Rossignol Sprayer BC 176cm (bit flimsy for me in wash outs), current binding mount at traditional

Had my eye on 2011 Line stepup 184cm or 2012 stepup 181cm. If I'm SWITCHING TO A TRUE CENTER MOUNT POINT mount point should I go on the longer side? Any thoughts on choice? also considering volkl walls.... open to other ideas

YO