What treatment would you recommend is best for straightening my teeth? How long would it take? What would the cost be? (Photos)

Hi, I'm 22 years old and currently studying at University in New Zealand. I've always been conscious of my teeth (especially my fangs!!!). I'm interested in what types of treatment would be available to me and which would be the most appropriate for my situation. I'm also interested in opinions for how long treatment may take for my teeth and what the cost may be. Any advice would be much appreciated! Thanks in advance! Jess