I lost my iPod on a plane. What should I replace it with?

Just came back from a trip and I think I left my pod in the pocket on the seat. Naturally, I will try to get it back but assuming I can’t, I have two questions. Should I replace my Nokia AT & T phone and iPod with an iTouch? Can I synch my iTunes account to a new iPod? ( I am not a very sophisticated phone or iPod user so I don’t know if an iPhone is worth it, but they are cool machines.)