Help with synching

Hi. My wife and I both have Curves (8320). We just got rid of our data plans in order to cut costs and would like to know if there is any way to sync our calendars via Bluetooth or WiFi. Google Sync was awesome for that because any time one of us added an appt. it would show up on the other's BlackBerry also, but it only works with a data plan and not over WiFi. We tried to sync them onto a common computer via Outlook, but in order for them to sync you have to manually sync one with outlook, then sync the other, and then sync the first one again (in order for both BlackBerry's to have all the appts). Does anyone know of a program or a better technique to share calendar info between two BlackBerry's? Thanks!