When I quit breastfeeding my son at around 10 mos I used both Similac and Enfamil. I found that he liked both with no preference. Both I think are good brand names. I am not huge on whether a fomula is organic, soy or what not. It would be up to you. Given how expensive formula is already, organic tends to be a little pricer, but if you have the means then go for it! I did try soy with my son once and he threw up the entire feeding... last time I tried the soy!

Hope it helps a little!