If you're not planning on spending much, why not look at this Knitted Hat. It's a fantastic product for a good price. Another strong contender for your wardrobe is this Bloomingdale's Beanie. While the price of this product is not very high, it will certainly attract a lot of attention.
If you have enough to afford it, then you absolutely must check out this Moncler Hat. This item seems pricey, but it's worth it.