All ordered! Hakka LT2, bog standard white steel rims, Pewag Brenta C 4x4 chains (2 pairs). Reason for doing it early was to get good pricing, and that went pretty well I think ... Many thanks to all who helped me get to this point!
As for Europe v Rockies, well having only ever skied Europe I couldn't possibly comment. Personally I love Argentiere (Grands Montets area) just outside Chamonix, and we're staying just up the hill from there. Having been there many times (but never for a season before) I know it well enough to find great skiing even without a guide, and there's a fantastic run down from the very top of Grands Montets. But it does get busy, and a fresh dump gets skied out very quickly. Of course the Rockies are on my list to do another year, Canadian friends tell me to got to Fernie or Big White ....