If you are on a limited budget, take a look at these Asos Slim Trousers. It's a great piece for a reasonable price. Another strong contender for your wardrobe is these Asos Fitted Pants. While the price of this product is not very high, it will definitely attract a lot of attention.
For something in the middle of the price range, check out these Slim Trousers. While the price is very reasonable, this product is an easy wardrobe update.