Don't sweat it man. Its not a life descision.
If you are really strapped for cash buy the 6 exa. I have had one for a year and have had several planes and I am happy with mine. I just posted my post above to see if anyone would try to tell you that the 6exa would limit you as to what kinda of plane you want, because I have found that it basically don't. At least the planes I've had.
If you had the extra cash it sounds like the 7c would give you more options and may be a better choice. But the 6exa is completely fine. I know people at my club that have non computer radios and are some of the best pilots. The transmitter don't make the pilot.
Good luck with whatever you choose.
I am not sure how far I want to go in the hobby.
What if you decided you wanted to take up golf. Would you go out and buy a really expensive set of clubs? Or would you just buy some decent ones and see how you like to play golf before you spent your money on some nicer clubs?
Wings