Class is about to start again here soon and im thinking of getting a pda.

What im looking for is:

*GPS
*640x480 (I know there coming if not already)
*Largest screen you can get
*WiFi/Wireless so i can connect to the internet
*Check email
*good web browser for the internet so I can post here on sharky will in class heh
I would also like to use VNC

What do you guys reccomend? Movies and mp3s would rock too

IPAQ 4155
Dell Axim X5?