Referring to the initial question about pros and cons of the areas mentioned:
- Zermatt
Ups: vast on-piste terrain, highest vertical drop by far (7000+ ft), best scenery, pistes go from very easy to most difficult and steep, got some après ski too, car free resort, excellent food
Downs: very, very pricey, often long, dry spells (but stable weather), high peak altitude (shouldn't be an issue if you handle the high Colorado resorts)
- Arlberg
Ups: vast off-piste terrain, decent vertical drop, usually gets a decent amount of fresh snow, great après ski in St. Anton, great area to grow into off-piste skiing (excellent ski school groups for that)
Downs: while there are challenging pistes the resorts are known for it's off-piste and backcountry skiing, unstable weather, very pricey, many ski bums
- Dolomites
Ups: often stable weather, awesome scenery, vast area (think resort hopping), great piste skiing for intermediates (but got some really challenging terrain too), great food, reasonably priced
Downs: snow situation often unpredictable with long, dry spells - check before you commit
Have fun!