If you're looking for an item in the middle of the price range, look no further than this Won Hundred Denim Shirt. This item doesn't cost the earth, but absolutely invaluable in your wardrobe. It's also worth considering this Acne Studios Denim Shirt. This product is ultra popular and, just as importantly, not too pricey.
If you're looking at it like an investment piece, then what you're looking for is this Saint Laurent Denim Shirt. It's more expensive but worth your money.