Hey have you taken a look at the Hitec line as for your needs and cost effect. The optic 6 and the optic 6 sport are both great choices also because you can get a module to work with what you have currently and also what you would hope to grow into. www.hitecrcd.com .

Here is what they come with, and I hope this help. Also the price is great bought one for my childrens trainer and they work great here is some info.

Available Models
•Stock #158241 Standard System Transmitter, (4) HS-325HB Ball Bearing Servos and Optima 7, 7 Channel Receiver, with Rechargeable Transmitter and Receiver Batteries and AC Charger

•Stock #158242 2.4GHz TX & RX Combo Transmitter and Optima 7, 7 Channel Receiver, Rechargeable Transmitter Batteries and AC Charger

•Stock #158243 2.4 GHz Super Value Combo Transmitter and 2 Optima 7, 7 Channel Receivers, Rechargeable Transmitter Batteries and AC Charger

Hope this helps..