Haven't had the $$$ for the TTI headers, but have run the studs with Hooker/Hedman/etc. It makes it a little challenging to get the headers back far enough to get over the studs, but if you can run them, do it...
Remember, the studs go into water, and if you've ever pulled a header because of a leak, and had all your coolant drain out because of header BOLTS being installed, then you'll be glad you stuck with the studs.