RE: Radio Upgrade
In my opinion, any of the multi-channel 2.4 GHz radios are the way to go. My choices would be as follows:
1. Spektrum DX7
2. Airtronics RDS8000
I own a Spektrum DX7 and love it. It's a 7 channel radio with 20 model memory.
I also own an Airtronics RD8000. Although this particular model (RD8000) is not 2.4 GHz, it is an 8 channel with multiple model memory. The RDS8000 is pretty much a clone of that radio. Tower Hobbies has them on sale for $230 US.
All your current servos will work with both radio systems (if they are Futaba as your current radio is). Other servos will also work just fine. This includes JR, Hitec, Futaba, Spektrum, and Airtronics, among others.
CGr.