Also, my friend has the 700w and its buttons are much easier to work with--you can message with one hand because the buttoms are easier to push. Will the 700p have "looser" buttons, too?
If you like the 700w buttons, you'll find the 700p buttons are the same (actually, they are

)
I was wondering if the Treo 700p includes the voice activation or whether we'd still have to pay extra for that feature
Yes, you'll have to register VoiceSignal which is bundled with the 700p.
-Chris