I'll back up Jc here, OP take a good look at android in the price range of the 710, 7.5 is pretty feature incomplete compared to ICS or JB.
Using WP for a 2.5 months cumulatively, I switch back to blackberry every time, but then give 710 another chance.
But email disappoints. Email attachments are limited to photos for example [unless you go into the app, and then probably you can share it- but not easily and not likely more than on file].
Yesterday I wanted call a number from a website, copied it. No way to paste or call it in the phone app. If you can find the 'place' via search local your fine, but that should be possible.
No universal search or notification 'center' eventually will get to you. I am using the 710 right now, and I cannot search any of my SMS conversations

Camera crashes for me sometimes, button or tapping screen will not work, requires restart.
Jc is right about sounds, some kind of profile thing would have been great. Global volumes affects everything [but not call volume]. If you are listening to music with headphones, new email will 'ding at the same volume.
This might just be my phone, but proximity sensor somehow allows the screen to turn on again and I have hung up many times by accident.
Still OP its your call. I say springing for an 8x would be better at least.