Problem is that on the street a lot (most) cages are more dangerous than not having a cage at all.
My advice: For the street - forget about cages and just revise your driving style. If you're doing serious track time with all the safety gear, then put in the best cage you can afford.
Sorry Spandex, i dont have any pics of my mates cage but he had around 220kw in his 1600 and rolled in on the street one night after someone stopping on an orange light and he was doing about 200k/hr when he lost control trying to pull the car up... ended up rolling it into a red light camera and knocked it down and ended up on the roof... came out completely unscathed, the cage saved not only his skin but the also saved the car from having to be scrapped. This was a car that was fully engineered with the cage so 100% legal. So yeah definitely not dangerous having one and well worth the investment.
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dattos aren't MEANT to be nice - they're meant to hardcore - occasional road use only, semi rally / racing cars with stripped interiors, full cages and a pair of webers.