The 6ex is fine,, EVEN for helis, I fly my T Rex Heli with a 6EX. Its a nice budget starter computer radio.

If you are SERIOUS about wanting a computer radio and you dont want to spend a mint for it... Get yourself a Futaba 9CAP (yes PCM, its better than FM and you will want it once you really understand what the difference between PCM and FM) and you wont ever NEED another radio. Its about $400 including 4 servos and a reciever. I have flown with a 9C, 9Z, 14M and JR 10x,,,,, and the 9C is more user friendly than the others and every bit as functional from a practical perspective. The 14M has a ton more bells and whistles, but the 9C basically has the same user friendly format and all of the functionality of a $1000 for $400. I think JR makes something similar to the Futaba 9C (maybe 8103?) but I know from experience with just about every radio you can get today that the 9C rocks.

Heres what it lacks from a 9Z and or 14M

Conditional programming. Whats that? My point exactly.
Windows format
Onboard Music playback.
Built in tachometer
Touch Screen
Moveable switches
A few other bells and whistles that are really nice but way beyond unnecessary.