I have a Nidecker SL but I think it is a 163. This is the first alpine board I have ridden (with the small exception of my first board which is a Burton Alps that I barely rode before buying the Nidecker).
I rode soft boots with high angles for a long time. I found by starting alpine on a relatively short board it was much easier to get the hang of it. I also really like having a short radius board to be able to navigate crowded slopes better.
I bought my board through the classified on this site (brand new a few years old).
Good luck in your decision.
********************************
Everybody looks good at the starting line.