If your starting with the zx-5 non sp. You might want to think about stocking up on some front end parts. Shock tower mounts, C-blocks and front arms. If you can find one get the SP upgrade kit. it's well worth the cost and is a much better handling ride.
I have raced a SP outdoors on 8th scale tracks all summer without any breakage problems. Set up so the nose doesn't dive on blown out jumps is the key to keeping the car together.
IF you can't find the SP upgrade. you can replace the front end parts with SP ones as you get wear and tear. Arms and hubs should only set you back about 20. The dogbones are the expensive part. somewhere in the 30 range I think.
good luck and keep driving