Yes, I have a 9810 and like it over most others.
You can get a 9810 at different places new or used. I would go for a new one that is not locked to a specific carrier to avoid issues.
all that's needed is for you to do a backup of the old one using DeskTop Manager software ( free ) and after that do a "switch devices"
This link will get you the DM software. BlackBerry Desktop Software - BlackBerry OS Software - US