There is no magic ju-ju with helmets. The low end (~$30-$65) are skate helmets that usually do not have snow/ski features (like ear coverings or goggle shelves). The mid-to-upper end ($70-$120) are standard helmets, Above that you get things like swappable liners and headphones, adjustable vents, etc.
No one in the US rates the efficacy of snow helmets. The most common ones in use today are compressed-styrofoam core 1-use helmets that are intended to be replaced after sustaining a critical hit. I have used skate helmets and snow helmets on the hill. The snow helmet are usually more comfortable.