i have a cage from chris alstons chassis works, nice, i think they are all about the same, i have heard good things about S&W race cars cages, i have had great experiances dealing with them, both are highly recomended, but in the end its the installer that makes or breaks a nice cage install
Grant http://cachassisworks.com http://www.swracecars.com
Call Ernie MacDaniel of Race Car Fabrications in South Florida.... His phone # is 954-791-9371.... He makes a custom fit rollbar for GNs/TRs w/ removable side bar that is NHRA legal and I'm pretty sure it is chromoly....
i had heard rumors that the removable side bars were not going to be allowed in the comming years, not sure how true the rumor is, and i don't have a current rule book, you might wana look into it.
Grant
Call or stop by a few race car builders in your area. Look at their work and talk about pricing. I talked with three before I had my bar custom bent. The bar was $700 including R&R of the interior. You can't even see the bar with the T-tops off and the doors closed and the back seat is still there.