Howdy Ray Darr
Like you, I too have been considering accepting the compromise and combining PDA and tri band mobile into one unit. As someone said previously, horses for courses.
Anyway, now to throw you the curve ball...
There is a unit I have been looking into, and most of the reviews etc read very well. It meets all your requirements, bar one.
Are you absolutly fixed on it running the Windows OS?
The unit is the Sony Ericcson P900. As I said, meets all your requirements, except it uses the latest Symbian OS. It is able to sync with your Windows desktop.
To me, it looks to be a very good unit. Horses for courses.....
Cheers, and good luck.