As obvious as it sounds, I strongly recommend shopping at a specialty bike store. They are the experts, and they will be able to help you decide which bike is best for you.
“But we're born as children and we look at the world with open eyes... And we don't judge and we don't betray. We're not jealous. We're not envious. We're not even weary, which is a danger also as kids. They have to learn a certain amount of awareness.”