I've always been a card guy since I've started out and still am but coin magic really sparks my interest. For the longest time I've been telling myself that I will pick up some coin books to start practicing but never done so until now. I got myself a copy of bobo coin magic which should arrive soon. That leaves me with what coins I should use. There are the Kennedy half dollars, walking liberty or the Morgan's. what is the difference between them and why are the libertys and morgans more expensive.