5zigen Exhaust

Which flavor of 5zigen do y'all prefer? I've perused the site, but can't find any specs on their systems. I like a nice, low, throaty purr... which would get me what I want? (GN+ catback system, A-Spec, Fire, Border, JDM)

Finally, it seems like no one even notices the 5zigen exhaust! I have the Fireball on my 4th gen Si and absolutely love it. 5zigen is a quality company and the sound is deep, throaty, and not annoying, but noticeable, especially with an intake. Power seems to be pretty good too. My ONLY complaint is the black finish on the piping, which CAN rust if you drive in snow with all that salt. Not a bad finish though, i didn't wash my car even once during winter, (very stupid) and there still were only little spots of rust on the very bottom part of the piping that faces the ground, and only in a couple places when I noticed it the other day. I would highly recommend the Fireball, but I haven't tried any of their other exhausts.