If you are on a limited budget, your best bet is this Ralph Lauren Scarf. It's a popular product, while not very expensive. Another strong contender for your wardrobe is this Twin-Set Scarf. While the price of this piece is not too high, it will certainly attract a lot of attention. You might also want to consider this Echo Scarf. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're on a hunt for a luxury item, then what you're looking for is this Saint Laurent Scarf. It's more expensive but worth your money.