TBH, as long as it does all (or most) of the things DCM has identified, you'll be fine with any radio.
The more you spend the more you'll be able to adjust and the more reliable/faster it's likely to be, though you are unlikely to be able to tell the difference between fast (which is what most modern 2.4GHz adios are) and REALLY fast (expensive modern 2.4GHz radios).
The only significant noticeable difference between the DX3C i had and the DX3R Pro i now have is that the trigger sits slightly closer to the hand grip. It does everything else in pretty much the same way, and has a few spangly toys.
But for driving a buggy round the track, i should really have stayed with the DX3C!
You've already got a good radio, so going to an expensive one will probably gain you less than using the money going to a faster servo or better ESC.
Oh, and reading the manual to find out what it can actually do is worthwhile.
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