Fuddle makes nice TC's that are affordable, The ch3ater cam or w/e they call it from thunder racing is something i've heard a lot of good things about, lots of power w/o the lope giving you away. I don't know of any companies making non-stainless steel headers yet, but stainless works apparently makes some really good ones right now.
Comp Cams is located in Memphis. Major cam manufacturer. Don't know any vendors in your area but I bet most can get a comp cam. http://www.compcams.com/
I know one local GTO owner that just put one in his '06.