"Fujitsubo Super Ex and Tanabe Medalion are definitely the best JDM headers you'll find but the Super Ex's are expensive new (especially with the crap $$) and the Medalion's have been discontinued for a long time now" These two brands are probably the only ones worth bothering with, but only practical if you can get them S/H, and this stuff is getting harder to find.
They are full stainless so they will last forever anyway, but they will need brackets to support the bottom of the headers at the block, rather than have all the weight hanging on the head.
I have found with S/H items these brackets may be missing, so you may have to make them.
Fujitsubo Super X headers with the pipes out to the cat weigh about 8 Kg less than stock items, a useful weight reduction at the rear of the car. Not sure about the Tanabe's but they may be similar.
I have the Fuji's on my own car, and I did notice the difference during hard acceleration when I first fitted them.