RE: Just ordered an Avalanche!
Airtronics makes a decent radio for about $50 or so dollars it's the Blazer Sport DR, comes with two servos, Micro Reciever and transmiter, very nice radio for the price. Then there's futaba. To help with Runaway problems you can put a Failsafe on the reciever. The fail safe is plugged in between the throttle servo and the reciever. Basically it monitors battery voltage and radio reception, if the voltage gets to low in the reciever it puts the brakes on, if the radio glitches or you get out of radio range the fail safe puts the brakes on and stops the car. Fail safes range anywhere from $15 to $40 depending on the options you want, some have sound and buzz when there's a problem, some have temp probes included with them.