Depends on what you want. If you want them to look brand new all the time and money isn't an issue get ceramic coated. If you don't mind looks MAC's are cheap and look decent. MAC just came out with ceramic coating, which is less than BBK ceramic coated headers. Then it depends on if you want shorties or long tubes. I went for the long tubes. I love the sound and the power!!
I have Ford Motorsport ceramic shorties, they've been on almost a year. I've been driving my car all winter long in the salt and snow and the headers still look like new. Its most likely the best quality part I've ever bought.