Yes it's a one week trip. Last year was a bit insane since we were in a different country every day for a week: Val d'Isere -2 days, Courmayeur heli, Chamonix/Vallee Blanche, Zermatt, Cervinia.
We are sticking with the train to St. Anton and stay for the week - especially with the Warth addition - and the total Arlberg interconnection. Also, I think it would be fun and scenic - No real reason for a car. If there is a down storm day, I always wanted to see Innsbruck which is just an hour down the tracks.
Kitzbuhel - if the snow is not good, then I would not really want to be there.
Davos - looks like a bunch of connections
Davos - I hear the town
Ischgl - looks great, but really need a car
I did want to do guided skiing - the goals being the obvious ones - Valluga and North Face of Rendl. So we will sign up for 2 guided days with Piste to Powder.
Finishing up lodging: Was trying to split the week - 4 nights St Anton, 3 Lech. Of course most places want you to do the full week, but there are options.
After the Arlberg, I will have knocked most of the interesting major Euro resorts off my bucket list:
(Zermatt/Cervinia, Chamonix/Courmayeur/Megeve/Les Contamines, Verbier, Val/Tignes, Les Arcs/La Plagne, 3 Vallees, La Grave/Serre Chevalier/Les 2 Alps).
This is likely the total antithesis of James' list

But I like the iconic massive resorts with HS Lifts.
I was interested last April of going to Engelberg and Andermatt - but abandoned the idea after seeing lots of green pastures in the valleys that might have limited the famed off-piste return routes. I would like to see these two.
Also, Cortina/Sella Ronda looks super scenic, mellow - and likely could be done anytime in life when lunch is more important than vertical.