Don't bother with the King Cobra, have heard quite a bit of negative on those with Cobra drivetrains. I've spun through Spec clutches quite quickly. Mcleod is a solid choice. Don't forget to replace the throw-out bearing and pick up a spare. They're cheap.

I have the Steeda quadrant, firewall adjuster, and adjustable cable. The cable has been the best in actually adjusting anything. Firewall one is conveniently located, but difficult to adjust. The cable is very simple to adjust (drive up on my trailer, reach it easily). The clutch quadrant manufacturer should match the one for your cable for piece of mind. Definitely worth the loot for sturdy construction but you'll lose the current ease of adjusting by lifting the pedal itself for a readjustment and instead have to rely on the firewall or cable adjuster.