How much is an iPhone 4, 4s, and 5?

I have upgrade due in feburary 2013, and I want to know much much an iPhone 4 cost with and upgrade vs without an upgrade, and what an iPhone 4s costs with vs without an upgrade, and what an iPhone 5 costs with an upgrade vs without an upgrade. So basically, tell me the six different prices, and please leave your opinion on which one you think is best for it's price, thanks!

IPhone 4 is free with 2year contract
iPhone 4s is $99 with 2year contract
iPhone 5 is $199 with 2year contract

Without upgrade:
iPhone 4 is $99
iPhone 4s is $199
iPhone 5 is $299