SCIENCE CIVILIAN needs help picking the best molecule choice from the PDB

I want to show my jr. high aged children the beauty of molecular structure. I am a molecule novice. Have found that when I search the PDB for anything, it gives me many choices and I am not sure which one to pick. Can your app help with this? So far I have searched for several of the archived molecules like antifreeze, cholera, penicillin, etc. Is the first choice the one I should go with?