You shouldn't be contacting Sony.
Try contacting a publisher. At least they would consider your game. Sony would just throw the proposal in the trash, without even reading it. And a publisher would be in charge of getting you a dev kit (at their cost) if they accepted your proposal.
You would have a lot more success with GarageGames, they will publish a PC version for you, and would be able to propose an Xbox Live Arcade version. Once a game is on Xbox Live Arcade and is selling well, you will have a much easier job finding a publisher for a PSP version.
