I want to buy a PDA but i don't know where to start.?

I am a senior graduating and i want something to help organize my life. I was going to buy a blackberry but that was a little too pricey. Im not sure where to start. I want something that has a good organizer and one that can play tetris. I was hoping for something cheap and easy to use. I was hoping it could help me help keep track of my life.