If you're looking for a thrifty option, your best bet is these American Apparel Leggings. It's a popular product, while not very expensive. Another savvy option is these Leggings. While the price is not very high, be sure that this product will become a worthy addition to your wardrobe. You might also want to consider these Lysse Leggings. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you can afford to splurge, then what you're looking for is these Givenchy Leggings. It's more expensive but worth your money. While you're at it, also have a look at these VPL Leggings. Yes, this item is expensive, but it does not mean it's not worth it.