Registering my foal

Question
Hi,
I have a newborn foal. He is a Friesian/Arabian cross. I've been researching registries for him and I found 5 or 6 that he is eligible for. How many should I register him in. Is there an advantage of having him registered in multiple registries? Will it make him more valuable if I ever decide to sell him? How should I choose which ones to register him in?
Thanks

Answer
My computer crashed which caused the delay in my response.  Sorry
It is always good to have your horse registered.  You should decide which of these registries is the most important to you and use them.  For identification purposes, having several registerations can be of value in recovering a horse if it is lost or stolen.  Also, you may be able to show your horse in several different types of shows.
    I hope this will be of benefit to you.  This is my opinion and you should do what you feel is your best path.