There has only been 1 iPhone and it came out in June of 2007 as far as models. There had been some talk of a newer one coming out at MacWorld in January of 2008, but they launched the Touch and new nanos. When the iPhone first came out it was available in 4G and 8G, but now they have the 8G and the 16G (which is new as far as space and I'm thinking maybe that's what you were asking). The 8G is $399 and the 16G is $499. If I were you, I would definitely get the 16G if it's in your budget. I got the 4G and it would be nice to have some more room to have more movies, music, tv shows, etc.