If you ask this question 2 - 3 years ago, I could give you a good answer. But nowadays, the cellphone had merged with the PDA. So the first question are you looking for a PDA or PDA in combination with phone?
i need a recommendation for a PDA too i think that will keep me on top of my schedules.. like studying and working etc
look 4 the HTC p3300 it is a cell phone and it has windows mobile on it and GPS and it looks good too! Some friends of mine have it, and i know it is sold a lot here in the netherlands!
If you just need to keep on top of your schedule and already have readily access to the internet... I say save on the PDA and stick with your good o cell phone. I recommend Google Calendar and enable the Text Messaging feature. It can send you reminders at a set time before the actual scheduled event. You can also text google to add new events (so you're not limited to web browsers). If you phone has WAP or internet access, then you can even view your calendar anytime via www.google.com/calendar/m If you're going on an african safari (and therefore no connection), google has printable formats. Because of Google Calendar, I'm up to date on my schedule and I don't have to carry a brick along with my much more portable/compact/stylish phone