Hi ergent,
I did a little research, because we had our baby, he was taking formula (he was 4 months old). I think all commercial formulas are about the same... I was told it wasn't necessary to use Nestle's Good Start formula (which is supposed to be easier to digest), but after trying the regular one I switched back to the Good Start because my baby had stomach aches...
I know, here in Canada, Loblaws sells an organic formula. We didn't try it, it wasn't on the market last year when we needed it. You can find the details on their web site (search organic baby formula, you'll find it).
One thing I was told to do if you switch formula, do it gradually over 3-4 days, mixing the new one with the old one.
Good luck!
Jalx