If you're budget-restricted, your best bet is this Poler Beanie. It's a popular product, while not very expensive. Another savvy option is this CTM Beanie. While the price is not too high, be sure that this piece will become a great addition to your wardrobe. You may also want to look at this Knitted Hat. This item is not expensive either, but it will make a difference in your wardrobe.
If you're a bargain hunter, why not look at this Blumarine Beanie. While the price is very reasonable, this product is an easy wardrobe update. You might also be interested in this Missoni Knitted Hat. It's an attractive option both price and quality-wise.