I'm 5'8" 145 lbs.
I ski fast, pretty much only steeps at mammoth. I ride my skis hard, lots of edge pressure. I don't smash them into rocks, and I only ride pipe if I'm in the park, which is rare.
I had the Seth Pistols, 179s. Way too soft to ski every day. The only day they were perfect was at Wolf Creek in chest deep fluff.
I got Arv 175s and they are plenty stiff for me. I'll probably get 185s next year. I prefer the ARV in any conditions to be totally honest. I can ski them perfectly in bumps, deep pow and tight steeps, the Seth pistols just weren't practical for me for making any more than 3 turns on any line.
I have both, I reccomend the ARV. This years ARV feel softer to me than last years, maybe I'm wrong...but I love my ARV's and will get another pair.