Grace
We love Updox in our office, it would just depend on how many faxes you send/receive. Since all our faxes come in to Updox, these are then imported into the patient chart without having to print anything. If someone requests records from us, we print the selected pages to Updox and send them from there (very easy).
Many on the board here use Paperport which doesn't cost per month.
Here's a link regarding faxing from AC that might help you
http://amazingcharts.com/ub/ubbthre.../Search/true/Re_Faxing_from_AC#Post35600