Originally Posted by JGBerry
just get unlimited for the extra peace of mind. all it takes is someone to send you a few attachments in a billing cycle and you're "F'ed"
T-mobile and Cingular/ATT have data plans at $30/month and $35/month respectively
First of all, you didn't help the OP at all. He said he doesn't want to get the unlimited plan and it is not even an option. Also, attachments are not automatically downloaded so that is not a problem.
To the OP: You will be fine with the 10mb plan. Your usage sounds exactly like mine and I don't even use 3mb/month. I am on the VZW 10mb plan and have yet to go over 3mb. It is true that the bb is always connected to the networks and is constantly sending data, but that data is only bytes or maybe kilobytes. It is not enough to worry about.
EDIT: What is your company discount? I only pay $24.99 per month with no discount. $24.29 is only like 3% (not very good.)