Dont bother with a rollcage, sticky tyres and some better disks and pads, cheap fun all day long. Cant go wrong with a 172 cup... But you have posted on a trophy forum...
I might have something coming up. Half cage, buckets harnesses, DS2500s braided lines with adjustable bias and fully polybushed front end. Freshly refurbished bilsteins and whiteline arb.