Go with a jacket, it's startin' to get a little cold in right where I live in the northwest corner, It'll keep you way warmer and it'll cushion and protect you a little more when youfall on the ice... Overall, it'll be a much better choice
Jacket is a given.
But, I do recommend the Line Static or Influence hoodies if your looking for a compromise. I love mine and use them 50% of the time I ski.