If you're not planning on spending much, your best bet is these Elizabeth and James Sunglasses. It's a wonderful product, while not very expensive. Another strong contender for your wardrobe is these Ray-Ban Sunglasses. While the price of this product is not too high, it will certainly attract a lot of attention. You may also want to look at these Sunglasses. This item is not expensive either, but it will make a difference in your wardrobe.
For something in the middle of the price range, look no further than these Lanvin Sunglasses. This item doesn't cost the earth, but definitely deserves a place in your wardrobe.