Which iPhone would you get with an upgrade?

I'm eligible for an upgrade on my Verizon account and I don't know which iPhone I should get. I could get the iPhone 6 16GB for $200, iPhone C for free, iPhone 5S for $100, iPhone 5 for $1. All of these prices are before taxes which will only be like $40. Please do not recommend other phones to me. I want an iPhone.

Always buy the most advanced, if you can afford it. I had a 4, 5, 5s, and now I have a 6. My kids inherit my old ones when they break theirs, and I get the upgrade. The 6 has a larger screen and a better camera.

Keep in mind you can trade in your current iphone and probably get alot of credit back for it. I would get 6 but it depends on your situation.