It's your decision of course and it's all up to you. Remember though that the 720 is a very good handling car. Any of those top cars out there can handle and will have a good showing at a big race, all dependant on how many quality drivers they pay for to race.
Keep in mind the maintenance of the car and the parts cost. For instance if you bend a CVD (which I haven't on mine by the way after many crashes
), it may cost you $30 to $40 each and I've seen a couple of them bend with minor accident despite the advertised strength. Just to name an example.
Anyway, like I said it's up to you and it's all about enjoying the hobby. Good luck and I hope you stay with the snake