If you are on a budget, your best bet is this Sole Society Hat. It's a popular product, while not very pricey. You might also want to check out this Hinge Hat. It's a product you'll fall in love with which also doesn't cost the earth. You may also want to look at this Brixton Hat. This item is not expensive either, but it will make a difference in your wardrobe.
If you're looking for something in between pricewise, you're in luck with this Frye Hat in stock and waiting for you. You are guaranteed to fall in love with this product. It's also worth checking out this Dsquared2 Hat. This product is extremely popular and, just as importantly, not very expensive. Take a look at this Rag & Bone Hat too! Great value for your money.