So, that's $10-$20 more than my current Cingular plan for my Treo, which includes unlimited MediaNet (allows Internet & email, although I don't know if they even officially offer that anymore). I currently pay $25/month for data, plus another $5/month for 200 text messages. My total bill now, with 450 minutes plus 5000 night/weekend, plus rollover, is $81 with taxes.
If I end up paying $35 a month instead of $25 for data, and it includes ANY text messages at that rate so I can avoid that $5/month I'm currently paying, that makes it only a $5/month difference. Even at $45/month for data, if it includes considerable text messages (since they'll be needed, since there's no iChat) -- that's not the end of the world. I might just squeak in under $100.
And yes, I know that comparable / better carriers are cheaper, but I'm already with Cingular -- whom I joined a few years ago when they had the Treo as an exclusive -- and I'm used to being gouged.