Which smartphone has a flexible, quick calendar function?

I am in need of smartphone with a high quality calendar. For the absent-minded user like me to find a calendar useful, it really must be quick and flexible to program.

I have a very nice Samsung Eternity, but I found two problems that have given me reason to stop using the calendar. One is the time-consuming quantity of submenus that are required (some frustratingly hidden), and the other is that the phone rings while I am teaching class.

I primarily need a very good PDA/appointment reminder that:

1. is VERY quick and easy to set appointments with
2. will wake up the calendar alarm without also allowing the phone to ring
3. has flexibility for alarms to be set for several advance times

I am not sure about the PC syncing (Windows XP), since I have never tried it, but it sounds like a useful feature. These other desires are expendable & secondary: built-in GPS (to avoid the costly AT&T subscription), wi-fi, bluetooth, long battery life/replaceable battery, good camera, etc.

After web research, I think Palm, LG, and Android might have models that are easy to use, but I am becoming confused over all the smartphone choices.

Thanks for your suggestions,

Rita

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