Mac would be at the bottom of my list and that's because I have them. I had the shop put on three different gaskets and it still tics in 5th under load. It prolly tics all the time, but I just can't hear it over the exhaust.
My ceramic coated BBK's have treated me pretty fair... Havent had any exhaust leaks (Yet) but on the downside the ceramic coating has worn off under the car by the collectors and they now have some surface rust...
I've got Kooks for the record and they're top notch...but they're also considered a mid-length header, not a long tube. Which is actually a benefit when you consider the additional ground clearance.
I have SLP for 6 months now, flawless fitment without haveing to dent like bbk's. great sound. hardest part of the install was getting the f---ing egr to hook back up.
I wouldn't do anything but SLP.