Get the best rollcage you can afford that is the main thing !!!, stay clear of fibrelgass doors, buy a good quality make of belts, you need a decent tank gaurd and sump gaurd.
If you listen to anything 3 things to spend your cash on . 1. Great brakes 2. Great suspension 3. Best rollcage you can afford and then after all that look ar engine
ohhh and have fun