The golf analogy is a good one. I did the same thing and bought my own starter set even though the course I worked at had 50 sets of Ping rental I had access to. I played equally bad with either and I liked that mine were mine...Eventually got better and went through a lot of sets.
I looked for this length based on my height before I read the sticky on here. When you say the length might be an issue, what exactly do you mean? Nose digging in? Going too fast? Too slow? Not going at all?
And since this is a beginner forum, don't laugh...Powder days are days are days when you get fresh snow?