Yes Stacy good start is good for brest fed babies, but at 9 1/2 months its not worth the battle to get them to take formula. They'll only be on formula a couple months that way, its easier on mom, and for babies tummy, to start cows milk as then its less of a transistion for them. Especially if you still want to bf once or twice a day, and even if you don't their bodies are ready to digest cows milk.
If your dead set against starting cows milk a stage 2 (6 months + not toddler) formula would be better anyway.