I am interested in buying various essential oils for the purpose of creating colognes/perfumes. That being said, I think using the essential oils for aromatherapy reasons as well would be a great idea as well. I would like to get a diffuser, but not sure of what to get (electric, clay, copper, etc). I have searched at places such as New Directions Aromatics, etc. What would the people experienced in aromatherapy recommend?