Welcome to the forums
. It is all a matter of what is needed and preference basically. If your daughter would get a pearl, you and her could PIN message back and forth, it would use data, therefore you would not have to pay txt messaging charges. Blackjack is an alright windows mobile device, I have read the battery life isnt great. I have never used a treo, so I wont wont give any advice there. This is a blackberry forum, I would say you will get alot of votes for the pearl. It is a great device though!