Do you need a Data or Smartphone? The first question here – and you'll need to take a hard, look at yourself – is simple: Are you an e-mail geek? If yes, then get a smartphone. Smartphones are designed handle e-mail as efficiently as technology allows. If not, a regular cell phone will do. You could get a smart just to look cool, but why have the extra features that you jsut are not going to use.
If you're one of those very busy, hyperorganized perople, you'll want superior synchronization features with your smartphone. In this case, Treos and Windows Mobile phones are excellent. Also, RIM Blackberries are pretty good
For pure e-mail excellence, nothing beats a Blackberry. There's a reason they call them Crackberry – they do what they do extremely well, and they do just about everything that can be done on a handheld wireless device.