Transmitter and Battery (one each)
4-Channel Receiver and Voltage Sensor (one each, for each model)
8-Channel Receiver (if you need more than 4 channels)
Get one of these instead of the 4-channel if your model needs more than 4 channels.
OrangeRX DSM2/DSMX transmitter module
If you want to fly a plane that uses a Spektrum DSM2/DSMX compatible receiver
Battery Charger and Accessories
The above Charger doesn't include a power supply. You can use an old PC power supply or laptop power supply if you've got one. If not, this one will do what you need.