I'm in the process of reading through GTD and want to implement the process.

One of the things that I want is the a smartphone to enter tasks, appointments and keep reminders in. I really don't want on email on demand, though with my job, I might end up using it if I have the capability.

I keep my appointments and contacts at work on Outlook Vista (and have XP on my laptop). There is no enterprise BB server at my company.

Given this, which is the best option to go with?
Palm Centro
Blackberry Pearl (or a bigger BB)
Motorola 9Qc - Windows Mobile