OK, my experiance with PDA's is that the absolute best PDA? Hands down is the one you didn't buy. Huh?! Thats right, don't get one, don't pay for one certainly... If it's given to you cool but most of them (and I am not talking just me) end up in a desk drawer somewhere, batteries dead, neglected and forgotten. Why? Because there is prolly about 30% of PDA owners who really need one, other than that it's a fashion thing. There were all kinds of folks at work who would religiously enter in their schedules, phone numbers, appointments, meetings, etc. They would synch them daily, take them everywhere with them, and never really have any use. It's a new toy for a little while but in the end most of us do not really need one.
They are fidgety, and from what I have seen at Booz Allen and here at this office, they are mostly good for confusing schedules, frustrating owners, and going out of date faster than a PC...
But thats just my experiance. Sony has a couple really cool ones with built in 2mega pixel cameras. The Visor was pretty sweet, as was the Compaq. But I think Palm might still be the way to go.