I agree with Corey. Not worth the extra fees for the data plan. If you need your email ALL the time and you people email a lot then it's worth it.
Admittedly, I'm rather jaded as I've used Blackberry's since they were introduced in 99. It was another way for the boss to have constant, unrestricted access to me. Maybe it wouldn't feel like such a burden if it's your own toy and not your boss's leash.
But it seems to me they're really geared toward instantaneous business communication. No music, no camera, nothing fun, just work stuff really. I'd say go to a cell phone store and look around. Every cell phone today will do emails and SMS - but they're also a lot more fun than Blackberries, imo.