If you are on a budget, your best bet is this Kate Spade Knitted Hat. It's a wonderful piece, while not very pricey. In this price range, you can also consider this Coal Knitted Hat. It's also a popular item and won't break the bank. You might also want to consider this Beanie Hat. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're gonna splurge, then you absolutely must check out this Saint Laurent Beanie. This product seems pricey, but it's well worth it. While you're at it, also have a look at this Moncler Knitted Hat. Yes, this item is expensive, but it does not mean it's not worth it. You can also take a look at this Etro Knitted Hat. You won't regret the money spent!