I use the cheapest but freshest milk I can find. I'm not a seasoned veteran like many here, but I've had some pretty good successes with cheddar, colby, brie, mozzarella, and so far so good on a Stilton, a Gouda, two tommes and a Fourme D'Ambert. I buy from Costco, Safeway, QFC, and Fred Meyer. The last two are in the Kroger family.