Unfortunately, it appears that the iPhone won't integrate with Microsoft Exchange. Without that, I can't justify it to my boss. The company standard is the Blackberry, which does integrate with Exchange. Since they're paying the freight, they get to say what I use.
If the iPhone would integrate with Exchange - fully, not just reading email via IMAP - I could justify it. My company is pretty liberal about such things; after all, they bought me a MacBook Pro. Even so, there's a limit, and the iPhone is on the wrong side of it.
Update: Well, maybe not. One columnist claims that Apple will announce soon - maybe tomorrow - that they have licensed the Exchange ActiveSync protocol. If so, then it becomes a lot more useful to me. I'd still like to know whether it'll work with the RX350's Bluetooth, though, before I pull the trigger.