I would say with a 1 yr contract $600-650 and 2yr contract $650-700. No contract figure on $800 for it. EV-DO is the reason they will claim a premium and Palm will claim its their quality (sorry its HTC's but thats mute).
Right now it seems virus attacks are more on the Symbian side than WM OS so I wouldn't worry too much. Also people need to recognize that while the OS developers need to close the loopholes in their OS's end users also need to pay attention to what they d/l if its free (and other wise $ONY) its has risks for being a virus.