I weighed all my options and ended up just having a custom 4 point roll bar welded in locally. The other options that I see on the market are not thrilling. But what everyone will tell you is it is ultimately down to your threshold for risk vs reward. I see many people using standard harness bars and those Schroth ASM harnesses and they are comfortable with that. Other like the bolt in style roll bars that are on the market. I just made the decision based on my personal preference, how I ultimately plan on using my car and tolerance for risk.
This is what is in my car --
http://www.ft86club.com/forums/showthread.php?t=96984