I'm about the same hight, and level, but a around 180-190 pounds, I bought a pair of 5stars in 175 last season, after demoing them in 168, 175, and 184.
The 184 were a definite hand full, but predominantly suited for cranking long to medium turns, and harsh in the trees.
The 168 were great on the groomers, surprisingly supported my weight with no problem, but too shoot and stiff for off piste.
The 175 were perfect!
Great in all range of turns and terrain, handles most bumps well, although yet to be tested in anything deeper then a foot or two.