Well... if given the choice with
1) Very good controller
2) TX, RX receiver set
3) Battery pack
4) Crystal set
5) 2 VR servos
The most obvious under SG$600 will be M8. However, due to recent crash of frequencies in tracks, failed safe is a very good feature when you lost control of your car! Futaba 3PJS follow very closely behind because of it's failed safe and PCM.
Ultimately, if got the money... my choice? JR R1 is my no one choice!