Went from the 7250 to the 8703e a month or so ago.
It's pretty simple. If you use the device strictly for email, then go for the 7250. If you like pictures & are also using the device as your primary phone, go for the 8703e. The phone on the 8703 is light years ahead of the 7250, with clarity, speakerphone, & dedicated end/send buttons.
For what it's worth, I love the 8703 & I loved the 7250. It was worth the upgrade from over here...