I'd have Eric Berry do it, if he is the best returner we have and he wants to. I would, unlike most players, give him a clear choice... in regards to his potential health relative to his massive future potential. He did return two kickoffs last year.
Gerald Jones did return a couple of kickoffs last year, and did ok... Denarius Moore would be a good choice when he returns to full health.
I do say that the shiftiness of Berry and Jones are more conducive to returning punts, whereas pure north/south speed are more important for kickoff returns.