I own an SP and use the following electronics which fit well in the low body clearance and perform flawlessly:
Orion Flashpoint ESC
Airtronics Micro 3 Channel FM RCVR
Hitec HS-55 steering servo
Airtronics M8 Radio
Had to buy the ESC and the servo, but transferred the balance from my 1/10 road car.
The Flashpoint ESC gives great proportional throttle control with soft braking and reverse for the "oops" factor. The Flashpoint is also very thin and can be servo taped to the servo, perfect for the low body clearance and limited space under the PC shells.
