For something in the middle of the price range, look no further than this Stella McCartney Coat. This item doesn't cost a fortune, but absolutely essential in your wardrobe. It's also worth taking a look at this J.W.Anderson Coat. This piece is extremely popular and, just as importantly, not very expensive.
If you're looking to purchase a designer item, then what you're looking for is this AR+ Coat. It's more expensive but worth your money. While you're at it, also have a look at this Max Mara Coat. Yes, this item is expensive, but it does not mean it's not worth it.