Which iphone should I get? Which one is the cheapest with the best picture quality?

Hi, I'm looking for a phone good a great photo quality. I was looking into getting an iphone… But would anyone say there are other phones that are better?
I'm hoping to buy the cheapest one and right now my options are getting the iphone 4s on a $0 plan or investing a bit more money and getting the 5c… Do you think its a good investment?

Get the iphone 5c. It has a great camera, where as the 4s is super outdated. I had to make this choice and I got the 5c and love it! It is a great investment and does almost everything all the other iphone 5 models does but for way cheaper.