Voyager, can it replace my Treo

I am looking for Advice from both Voyager and Palm users, hoping some of you who know more about these can give me an answer.

I would like to replace my Treo 700P, Verizon is my only cellular provider so IPhone is not an option.

These are the most important options I am looking for in order.
Clear Phone sound
Speaker phone
Detailed Contacts
Large Screen
Email
Portability
Calendar