I'm a smidge under 5'11 and a bit under 165. Skied on the 186cm 100' for a season before the public knew they existed. The 100 will be more useable in varied conditions with a better more balanced platform when you are off piste. On piste if its a 35/40+ degree super hard surface the fronts will shudder through the finish of the turn if you carry alot of speed. Never noticeable any other time and super stable more so than the 90. In the NW we get lots of icy days as well as crud (where the 100 absolutely kills it) and pow pow. The 100 is so fun you'll put that 8000 away imo. It became my go to ski. 3 pairs later I'm burned out on em and trying other skis now. Another ski to consider would be the Movement Source or a slightly more progressive one I just picked up from BC the Lib Tech NAS Freeride Recurve.

You go with the 100s. My quiver (as a racer) are my race skis for the groomers, but then the Prophet 100 and the Volkl Gotama, and its a dream. You will not regret the 100's, and don't waste your 10 cm. on something that won't hold up as well on a pow day.

I purchased the Prophet 100 in 2007 as a northeast pow ski after demoing the P90. I quickly realized that they rip up the groomers, bumps, glades, and made sticking big air landings easier. I have not met a condition that these skis did not excel in. My last ski was a Volkl AC3 Unlimited. Since getting the P100's the Volkls stay in the garage. Go with the 100's. You won't regret it.

If you looking to use them in pow, go with the 100's. If you wanted an all around that can do pow as well, go with 90's. But since you've got your everyday sticks, these are a great powder ski for the east and the trips to the deeps out west.