I think it depends what other gadgets you've got and what you need them for. I've got the 16gb iPhone 4 which to be honest does me fine as I've got a 120gb iPod classic which is exclusively used for music in my car then I have a little music on my iPhone for when I'm walking around to and from college etc. I also just got a 32gb iPad which I can use for more of the bigger sized apps that I have on my iphone like some games.