ESCYou could try many, but the Medusa which has a 2 Amp or a 3.5 Amp version and I have used with no issues at all for years this is their info :
Maximum Input Voltage 45Volts,continuous current rating is 3.5 Amps while peak currents of upto 4Amps are handled easily. Minimum input voltage is 8Volts. Typical number of servos that can be supported is 8.
Output voltage is held costant at 5.1or 6.1 volts under specified load conditions , when input voltage falls below 8 volts the output voltage will track the input voltage. This is true down to 4 volts. Below 4 volts the output goes to zero.
There are many others but I know this works and I have used them in craft from 450 to 600s... no problems..
Hope this helps
Esprit Model Flight Team