You won't regret buying any longtube header that is currently available. I bought JBA's, but I can't knock any of the others. They all seem to be putting out similar performance.
The Hookers & SLP are a good bang for the buck. However my first priority was to have a stainless header. You can get the Hookers & SLP's with a ceramic coating, but I've even seen ceramic coating get chipped and/or burned away after a few years. I keep my cars a long time so longevity was my priority.
The reason I bought JBA's over Kook's or Stainless Works was price. I almost bought Kook's but I just didn't want to deal with their individual primaries slip fitting into the collector. This makes for easy install, but I was it wasseeing it as being more areas for possible future exhaust leaks.
I was going to get the bare stainless headers, but the only reason I got the Titanium finish was because I found a good deal on EBay after originally finding the guy here on StangNet. He bought the headers/H-pipe before he got his car, but ended up buying an F150 instead
I ended up getting the Titanium headers & h pipe for just a few bucks more than the bare JBA longtubes only.
The titanium coating PROBABLY keeps underhood temps down a couple degrees but probably not enough to worry about. The bare stainless headers should be fine.
Kook's & Stainless Works are indeed awesome headers. It's just a matter of how much do you want to spend, and I didn't see enough performance gap (none actually) to validate the extra $$$.
I can tell you the JBA's fit like a glove, sound awesome, and there's all kind of room under the hood if you remove the starter & motor mount brackets.