If you're a frugal shopper, this Semicouture Rollneck will fit the bill. It's a great choice, while not very expensive. Another strong contender for your wardrobe is this Eileen Fisher Rollneck. While the price of this product is rather reasonable, it will certainly attract a lot of attention. You may also want to look at this Benetton Turtleneck. This item is not expensive either, but it will make a difference in your wardrobe.
If you want to splurge, then what you're looking for is this Avant Toi Turtleneck. It's more expensive but worth your money. While you're at it, also have a look at this Chloé Turtleneck. Yes, this item is expensive, but it does not mean it's not worth it. And one more item you might be interested in is this Haider Ackermann Turtleneck. 'Cause you deserve nothing but all the finer things!