Upgrade vs Termination

After being a loyal customer for 9 years plus I think it is time for a change. I recently changed my plan on 2 lines to the everything plan. I wanted to change my phone to utilize all the great features but it came with a cost. I inquired 3 times to customer service about the instant savings and mail in rebate but I was informed that it is for new customers only or that I can open a new line (why would I do that). This leaves me with retail that is not possible. I aksed what the early terrmination fee would be and I was told $200. I am currently looking for service from another carrier that will provide me with a pda phone and service at a low cost (I CAN TRANSFER MY NUMBER) and a sprint is willing to lose a customer that pays over $2500 a yr. over instant savings and mail in rebate. iphone next?