Simmons Family Farm (from Farmington CT) makes by far the best flavored cow's milk yogurt I've ever tasted. Amazingly, it's even low fat. And inexpensive.
The peach, strawberry, and vanilla flavors are so beautiful and so true that I lapse into reverie. The texture is creamy and luxurious, but with a clean finish due to the lack of fat. I honestly don't know how they do it.
The only retailer I've found is Holbrook Farms in Bethel, CT http://www.holbrookfarm.net/
Simmons Farm is apparently in financial trouble (see article linked to below). If you know wholesalers or retailers, please point them to this product.