If you are in an area that does not have WiFi there is a good chance that 3g will be available. If all you are going to do is read then 3g is superfluous. If you are watching movies, searching the internet, online shopping etc then having 3g is beneficial. So in my opinion it depends upon what you are wanting to do with the Kindle. I have one of the older ones and generally use it to read. I have at times searched the internet but 3g was included when I purchased the unit.
DW