That 163 for $330 shipped is super tempting but if it's going to be too long I'd rather pass and get a slightly shorter board... Should I look for a 161/159 with basically powder and groomer riding in mind?
Personally, I think 163 would be a good size for you. I learned on a 165 at around 200 lbs, and now regularly ride boards that are 170+, so in my mind 163 really isn't that big at all. A few cm more or less really won't make that big a difference anyway.
The Legacy is a wide version of the SL, and with a size 10 boot just the regular SL might be the way to go if you want to go a little bit softer or something you can ride switch a little bit easier. The Premier doesn't even come in a wide, if it did I probably would have gone with that instead of the Heritage this year.