There are a few questions before buying a new PDA. You should consider them carefully and choose a right product as there are too many products in the market.
Question 1
Budget?
How much you are willing to spend will also be an important question. The more you spend, the more that your PDA will act like a laptop. That is not to say that if you spend little, that you cannot get much. The $99 PalmOne Zire 22 is capable as a replacement to the paper planner, as well as has the ability to play MP3s and carry large reference materials via the SD (secure digital) memory card slot.
As a general rule, spending $100 will get you a basic PDA; up to $200 can get you a PDA with a camera, MP3 player, or included document editing abilities; up to $350 will net you a midrange PDA that can have wireless connectivity (wifi or Bluetooth) along with cameras, MP3 players, and full document editing; over $400 will get you enhanced screens (higher resolutions than lower models), dual wireless capabilities on some models, more included software, and much more memory (up to 128MB internally on some models) than lower priced models.
Question 2
What to do with the...