Tbh, it depends on if your gonna use all the features if you get an iPhone, then it becomes 100% worth it.
Also, tbh, I think the very first iPhone was a little bit of a fasion statement, but the 3G, and 3Gs really are proper featured phones, especially with the latest 3.0 update.
Being a iPhone 3G owner, and proud, I never leave it, I always have it with me where I go cos it has everything I need on it when I dont have a computer around me, aswell as stuff like the iPod app to listen to music to.. and ofcourse the phone feature

I coulnt survive without my iPhone