For caucasian curly hair, I would say that regardless of brand, get one that is 1 inch wide or LESS....that can heat up to between 475-600 degrees....and has a beveled edge.
The small width is MORE than ample enough to put the gloss & smooth in (most of the work is done with a hair dryer before then, although I swear by my flat iron), and it allows two things:
- Getting close to the scalp
- Adding flip, curl, arc, or perfect straightening depending on your mood
The heat lets you move quickly and efficently... and keep it on HIGH. Lower heat takes longer and damages your hair more.
The beveled edge keeps you from breaking hairs (and from accidentally putting 90 degree corners in your hair if you get surprised by something and turn your head ;).
I've used one for years and years now (ever since I learned how to blow out my ringlet-type, near ethnic, hair) and the name brands, for me aren't worth it. I buy (the industrial version!) the generic black with gold plate kind used by salons from a local beauty supply store that sells to the public. Around 70 bucks. They last with no problem for about 3-7 years.
Other great products:
Kerastase Oleo Relax Serum : Smells great, adds shine and softness, helps protect from the damp, and lasts for about 2 months being used every day. (Good thing, darn little bottles cost 30 bucks)