i was browsing through some of threads and read some guys debating about which is better for manifolds, stainless steel, or cast iron. well here it is if u want one of the best if not the best.
http://www.revhard.com/manifolds.html
rev hard offer three types, cast iron for the regulars, tubular for the serious folks, and thier racing manifolds for the hardcore extremist. they even have ceramic coating as an option. rev hard manifold are so well constructed that even the best import racers running 8's and 9's use them. so if quality and price is not an issue, look no further.