Thunderheader makes one of the best 2:1 pipes for performance according to those that have them and a lot of people that don't. They have a very unique look and sound. I haven't heard anything about the Road Rage pipe and haven't seen or heard of too many people having it (I do know exactly what pipe you are talking about though). But I would say get which ever one YOU like the looks and sounds of the best.
Sound is my main concern. Looking for an opinon from someone who has heard both. I like the looks of the bassani, it's cheaper, and I think the performance of the two is pretty equal.