If you are on a limited budget, check out this BCBGeneration Trench. It's a fantastic piece for a reasonable price. You can also check out this Kensie Trench. It's an item you'll fall in love with which also doesn't cost the earth. You might also want to consider this Mango Trench. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
If you're not the one to skimp on clothes, then you won't be disappointed if you check out this Chanel Trench Coat. It's a costly but smart option. While you're at it, also have a look at this Stella McCartney Trench. Yes, this item is expensive, but it does not mean it's not worth it. You might also be interested in this Burberry Trench. You won't regret the money spent!