Icy,
Agree with you, Italy presents some great skiing with lots of modern facilities in the big resorts. Try it, you'll love it. January and February are fine times to go. Let's face it you can get shite weather at anytime if you're going for just 4 days. Dolomites are fantastic, but you may need to try smaller hotels and guest houses for short stay, but at that time of year they are generally accommodating. Try Ortisei in
Val Gardena or Cortina d'Ampezzo....you won't ski either of those out in 4 days. Haven't been to Madonna yet, but it's on my list.