I'm confused about what it is you're looking for lol. A roll cage is not a good idea for a daily driven street car - a hassle to enter and exit, expensive, and dangerous if you're in a crash on the street - imagine your non helmeted head slapping one of the bars in a collision - you'd be kind of messed up
As for an anti-roll bar, or sway bar as they're commonly called, I reccomend the Progress 22mm Rear Sway Bar. I have it and absolutely love it - it's also designed to work with the factory front. Any bigger rear sway than that and you should upgrade the front as well, bc any bigger could result in some nasty oversteer in tricky situations. And replacing a fsb is supposedly kind of a pita.