what is the best diffuser to get?

I have curly hair and i have the conair infiniti hair dryer (its this bright blue color but i think it also comes in pink). It comes with a blow out attachment and then a diffuser attachment. It works really, really good! You can change the heat and also how "fast" the air comes out..if you know what i mean. My mom even bought herself one since she liked mine so much! Oh, and its around 20 / 25 bucks!

Honestly, the cheaper the hair dryer, the worst the results.

If this is something that you will be using on a daily or almost daily basis for years to come, invest in something that is more expensive with a good quality. I suggest going to a salon and asking the stylists which ones they suggest for your hair type.