Addicted to race! Need to keep important spares

[superek4]

I am addicted to my local club race once a month. I do not want to go home becoz of failed electronics.

I am running 2 class 1/8 ep truggy n ep buggy. I hv limited $ to keep all spares so I am thinking what's the top list.

1. Esc
2. Tx
3. Rx
4. Motor

spares of car, batt I have already.