It's a pain in the ass having a BB if you are Mac user, trust me. I normaly use my work laptop with Windows on it to sync my contacts. You will probably have to download PocketMac for Blackberrys (I supplied the link below).
I recently switched from the 8310 to the 9300 great phone so far, BTW. How's the battery life iggy? Mine can barely do a day and a half without having to recharge.
http://na.blackberry.com/eng/services/desktop/mac.jsp