To iphone or Not to iphone

So, I think I want an iphone. I've had the "get a new phone" itch for about a month now. In the past I've always been stingy when it comes to phone expenses. I always go for one of the free models and never get a new phone until it's time to upgrade. I guess I don't mind coughing up the 200 for the phone because I've played with my sister's and decided it is totally cool, but I'm hung up on the 30 dollar a month data plan fee. Will it really be worth it? What do all you iphoners out there say? Worth every penny? Other pros/cons you care to share??