Any toothpaste will do as long as it contains fluoride ( from 4 years old to adulthood).
@krispie: Cheap sensodyne? Sorry I don't know where they sell it cheap.
To reduce sensitivity, try brushing in a slower, gentler fashion using short, circular strokes. It's not how vigorously/forcefully you brush your teeth that matters. What's important is that you brush your teeth for at least 4 minutes.
I've had patients who are overzealous at brushing that the enamel of their teeth becomes abraded.