Replying to 07 k2 seth inquiry

So im thinking of getting some for ripping pow hitting small cliffs and bc kickers and what not but i also what to be comfortable on groomers. Im about 5'6 maybe 5'7 seven and between 165-170 pounds. Would the 179's be to long for me? Would it just take some getting used to or would it be no prob? I do like the colour of the 169s better but im thinkin that may be a lil short for what i want. Also ive heard that K2's actually measure a little longer then marked or somethign and thats part of the reason im havin doubts.. any thoughts?