So back to the original point of the thread; there are two available locally. If I measure out later to be about a size 10, should I go with the 157 or 161?
I'd recommend the 157, as a beginner you can go a little shorter, makes turns easier to do/learn.
The 161 would be better for deep powder and going fast in big open bowls but that's a ways down the road.
Have fun, lots of would kill to live in UT and have those hills as our home turf.