Silk. My daughter wouldn't drink any other brand of soy milk. She has been drinking soy formula and "milk" since she was about 10 months old. She had a milk allergy. I have heard that giving girls soy will help to prevent breast cancer in the future.
My daughter drinks Great Value Original Soy Milk (Walmart brand) and has had no problems. She loves it, and is developing right on schedule!
I get the same Silk soy milk as you do for my son, and he's doing great after almost 3 years of drinkg it. It is whole milk but fortified.
I don't know if it is available in your area, but I buy one called West Soy at my local Dollar Tree store. It comes in quart cartons that do not have to be refrigerated until they are opened. I think Walmart also sells it. I get the plain but it comes in vanilla and I think chocolate as well. It is as good as any out there and I can buy in bulk and store in my pantry until I am ready to use it. I keep 2 cartons in the fridge cooling at all times. Pour it into a pitcher to dispense.