Finally someone near my weight (141). I recently demoed the Vertigo Motion in a 170cm, along with the P50 Motion, the G3 and the G4, in similar lengths or longer. The G4 is built for speed and off-piste. G3 is a great balance of strengths for all mountain everything. Vertigo Motion is a smoother, kinda mellow G3. On the groomed runs, the P50 really impressed me with its pop. I love that ski, but only on hard snow. For my ability (almost expert), the Vertigo Motion in a 170 would be the ski I would buy if I had to buy only one. But in soft snow, the G4 is preferable and on hard surfaces, I like the P50 more.
If you like short, tight turns on grooms, I think 170cm length will be more fun, but off-piste, 177 would probably be better. If you demo them all like I did, you may want to take them all home.