Where can I get good aftermarket headers?

What is the usual type you guys upgrade to?
1. Stainless steel?
2. 4-2-1, 4-1-1 or 4-1? What are the differences?

How much should I be spending for these? What else do I need to know?

Heard from Fremuff thier headers are not mandrell bent for the mean time because thier equipment is busted.

My other choice is nodalo's but just not quite sure if they're OK.