syncing iphone to new computer without losing contacts

im trying to sync my phone to my new computer without losing all my contacts.

i dont care about the photos or music, ive got all the music on my computer anyway..... and the photos i can recover from the phone without syncing.... but as soon as i do the sync its going to clear all my contacts and and start fresh, as there is no history of my phone on my new computer.

ive gone from a broken pc ( its dead, so i cant get the old itunes history) , and now i have a MAC, and im worried that when i say YES to the sync its going to wipe the phone clean and sync it with a contact file that is blank.....

so is there a way i can get the contacts off my phone before i do the sync so i don't lose them.... PLEASE HELP ME... THANKS