Most "shiny" headers are nickle plated, as nickle holds up to heat far better than chrome. I bought the JBA shorties on my son's car from Sacramento Mustang, but they're probably way cheaper at Summit Racing. I got my ceramic coated FlowTech's off our favorite auction site for about $125 (still in the original box :

. I got the Hooker Comps that are going onto my sportsroof at the Petaluma Swap Meet for $35.
So you see, there's all kinds of options as to where to get headers.
I recommend ceramic coated, though, over nickle plated. The difference in heat disapation is nothing short of amazing, and the ceramic coating is more durable than nickle.