"I didn't pick live forever because it would suck to see all your friends/lovers/kids die, over and over again. "
Excellent point. Although living forever would give you vast, unimaginable knowledge and scope over the course and history of human events. It might be worth it to be a loner.
Also, if you chose immortality, you could do some pretty incredible stuff...get launched to Mars and walk around... nothing could kill you. I'd be down to kick it on mars... bring a beach lounger and a little dune buggy or something.