question:
is there a PDA out there which has a MOBILE PHONE , BLUETOOTH and GPS system included in it?
yes. Motorola A series A920, A925, A1000 comes with GPS + Bluetooth etc
hmm thanks dude .. ishall do some research.. if there is somin i shud know related to these gizmos tell me 
your welcome. I think you should also check this.
I think the iMate also has all the features u mentioned