Most Helpful Girl
I honestly think the blond you have now suits you well :o but if you do want a change go Auburn. This is a brown with lots of red undertones. I think you might regret going completely brown. So this is a good in between color that will be light enough so that if you want to go back blond you can without to much damage.
Also ask for a temporary color, so you can try it out without the complete commitment to the color. :)