If you're budget-restricted, your best bet is this The Fifth Label Coat. It's a terrific piece, while not very costly. Another strong contender for your wardrobe is this Coat. While the price of this piece is rather reasonable, it will surely attract a lot of attention. You might also want to consider this Free People Coat. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
For something in the middle of the price range, you're in luck with this Mackage Coat in stock and waiting for you. You are guaranteed to fall in love with this piece. You can also take a look at this Rebecca Taylor Coat. It's an attractive option both price and quality-wise. And do check out this Rag & Bone Coat! It's a very popular item and good value for money.
If you can afford it, then you absolutely must check out this Mackage Duster Coat. This product seems expensive, but it's worth it.