If you're a budget-conscious shopper, your best bet is this Notte by Marchesa Cocktail Dress. It's a popular piece, while not very costly. Another strong contender for your wardrobe is this Sabrina Party Dress. While the price of this piece is not very high, it will certainly attract a lot of attention. You might also want to consider this Party Dress. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.