Radio snippets would make it far more satisfying I think. It brings across the emotion in the voices, making the impact more real.
If you ever want to pursue this game commercially, I have a few professional voice actors who would love to jump on board (for a small fee). I could do writing for free, if needed.
If not, try getting friends to voice it! Make it a fun group project that strengthens bonds, about a game that covers exactly that :D
You can't go wrong, either way.