I'm a prospective Blackberry buyer, early 20's, work in Immigration....
I was drawn towards Blackberry through a promotion here in Qatar for the Blackberry Curve 8530 and I want to gather more information before I make a purchase.
Ideally, i'd like the device to offer media, wi-fi, e-mail, social networking applications.....
Honestly, that is almost all smartphones. With BlackBerry devices, the email is instant (or near instant) and has a lot of room for customization when it comes to your signature and/or reply-to address.
Currently BlackBerry devices (new) that would meet your criteria:
BlackBerry 9700 - T-mobile USA or AT&T
BlackBerry 8520 - T-mobile USA or AT&T
BlackBerry 8900 - T-mobile USA or AT&T
BlackBerry 9550 - Verizon
Sprint currently doesn't have a BlackBerry with wifi.