If you're a frugal shopper, your best bet is this BCBGeneration Hat. It's a terrific piece, while not very pricey. In this price range, you can also take a look at this Hat. It's also a popular item and won't break the bank. You might also want to consider this Betmar Hat. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you can afford to spend a little more, we've got your back with this Eric Javits Hat. This item is likely to become a total wardrobe staple. You might also want to take a look at this Betmar Hat. It's an attractive option both price and quality-wise. And do check out this Scala Hat! It's a very popular item and good value for money.