If you're in a thrifty mode, this Hugo Boss Sport Coat will fit the bill. It's a popular choice, while not very pricey. Another strong contender for your wardrobe is this Jil Sander Coat. While the price of this piece is rather reasonable, it will certainly attract a lot of attention. You may also want to look at this Selected Blazer. This item is not expensive either, but it will make a difference in your wardrobe.
If you can afford to splurge, then what you're looking for is this Blazer. It's more expensive but worth your money. While you're at it, also have a look at this Armani Collezioni Blazer. Yes, this item is expensive, but it does not mean it's not worth it. You might also want to take a look at this Paul Smith Coat. You won't regret the money spent!