If you're not planning on spending much, your best bet is this Topshop Shift Dress. It's a fantastic item, while not very pricey. Another strong contender for your wardrobe is this Karen Kane Shift Dress. While the price of this piece is competitive, it will surely attract a lot of attention. You might also want to consider this BB Dakota Shift Dress. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.