There is a company in Canada that I have a contract and NDA with for an iPhone app design. I recevied some emails several months ago that they would not be able to develop the app right now and would contact me later, however I did some research today and saw that they have made my app and it was released mid Sept. The contract states that they were to pay me $500 for the game idea, the rights to develop it, and the first 50 levels of it which I provided. And I was also to receive 10% from sales, although it appears that it is free right now. They did pay me $100 up front, so the total I would sue for is $400, plus any sales that may make on it.
I know $500 isn't a huge amount (but it is to me as I am just a college student), so I'm trying to figure out if it is worth suing them over. I think I have plenty of evidence that the game is mine and that they owe me the money, so I don't think a lawyer would be necessary, although my brother is in his last year of law school now and might can help me out. If I were to sue them, would it be in a local court to me (Birmingham, AL) or would I have to go to Canada. If it matters, I did add a clause to the contract that they signed that states "The parties hereto agree that this contract, together with the rights and obligations imposed under it, will be bound by the laws applicable in the United States of America at the date hereof."
I know it's not a huge amount of money, but I could really use it, and I'm just extremely ticked that they can steal my ideas and just get away with it. If nothing else, I would like to scare them into hopefully paying me if they think I am going to sue for it.

