What do you need the phone for? Blackberries are the best for email. If your need for email is what is driving the decision then get one of the blackberries.
Personally I think the curve would be the way to go, but alot of people like the pearl. Email on a black berry is fast and almost instantaneous, with very little problem.
If you want High speed data access, and email is less important, then go with the blackjack.
