I have a sprint hero phone that somehow has been water damaged. It still works now but probally not for long?

I have had it for seven months with no insurance. My manufactors warranty does not cover water damage. My battery was water damaged also,and was leaking inside my phone whenever it was charging. I have tried putting it in a bag of rice in a plastic bag. I want to know what are all of my options. I know a place that sells used hero phones for 150.00 dollars used. Is that worth it,or should I save up to buy the evo. What are some places that I can get it at the cheapest prices since I wont need a new contract. What are the differences between the evo.and now evo shift. I appreciate whatever answers you can supply.