If you can’t spend much, these Spanx Tights will fit the bill. It's a great choice, while not very expensive. Another strong contender for your wardrobe is these Nordstrom Tights. While the price of this piece is not too high, it will surely attract a lot of attention.
For something in the middle of the price range, why not consider these Smartwool Tights. While the price is very reasonable, this item is an easy wardrobe update.