Brian,

Get the best boots you can afford. Fit is crucial for good sking. By far the most important part of your ski kit.

Softshells have improved so much over the past few years that I'd go for a jacket and pants in that genre. I still ski in a lined eVent parka, but it's now overkill. And a softshell is great for spring skiing.

Day pack or a RIBZ front pack – perfect for your own stuff inbounds, and can be paired with a day pack if you have your son with you. See http://www.ribzwear.com/ Mystery Ranch makes the best ski packs: http://www.mysteryranch.com

Richard