If you're in a thrifty mode, your best bet is this J.Crew Sweatshirt. It's a fantastic piece, while not very costly. Another great option is this J.Crew Turtleneck. While the price is not very high, be sure that this item will become a great addition to your wardrobe.
For something in the middle of the price range, why not look at this J.Crew Turtleneck. While the price is very reasonable, this product is an easy wardrobe update. Also consider this J.Crew Sweater. It's an attractive option both price and quality-wise.
If you can afford it, why not take a look at this J.Crew Hoodie - a great luxury choice. While you're at it, also have a look at this J.Crew Sweater. Yes, this item is expensive, but it does not mean it's not worth it.