Best Battery Life Pda I'm Looking For A PDA Or Smartphone With Windows Mobile That Has GPS And Good Battery Life?

I'm looking for a PDA or smartphone with windows mobile that has GPS and good battery life? - best battery life pda

I prefer Windows Mobile Palm OS, but it is too
You need to GPS
Must have good / battery.
There should be a good WiFi / Internet capabilities

He did not have many functions. When all this on a cell phone / smartphone, great, even better.

Someone knows what they can to these characteristics, or a good experience with a smartphone PDA had?

The price is not too big problem, if not more than 800,

Thanks