You want one that has the thick flange, like 1/2" not the 1/4" like pacesetter! They will work for a short time, until they warp and leak. Anything that is good/high quality is gonna run ya like $400 plus just for the header! I was gonna get a good header until I saw the prices, and decided that I'll get a header later down the road! Got a stock manifold, and downpipe for free.
I got the large manifold style (older) than the header looking style manifold. Told it has better scavaging properties!
The way to really look at it is. Do I want to spend $500 for a header and a couple hundred more for the pipe, cat and muffler, or do I want to spend $500 for a complete exhaust system? This helped me decide!