Organic Pastures supplements with grain. And ecoli in a toddler is a very very serious condition. I wouldn't personally risk it. I've met the owner many times and I respect his methods but cows are dirty animals and fecal contamination is going to happen and *does happen* every year with raw milk. I adore their cream (when not pregnant or nursing) but I wouldn't give it to kids. I like kidneys and livers.
As for taste, I've heard people say they prefer Cravale.
You might try Organic Vally new "grass milk" available at some of the larger Whole Foods. We've really enjoyed it lately and my kids seem to prefer it to our Clover/Organic Valley choices in the past. Totally grass fed, probably seasonal as is their grass fed butter. http://www.organicvalley.coop/products/milk/grassmilk/ Neither of my kids have drunk cow's milk in an significant way but they do really seem to prefer this milk.