I 'm thinking of getting a PDA, my budget is $200. I really don't know much about PDA, so I must ask the wise threaders of MacRumors to help me decide which one to buy. I just need to have a calendar, address book, hold pictures, and play MP3's. I know there are programs like The Missing Sync for syncing, but I really don't have a clue, which OS is better or which hardware is better. Please Help 