well, got my iphone last night and finally finished activation last night while i was asleep.
i've tested out my multi-mac sync and it does in fact work!
i've got it setup on both my mac pro and macbook pro.
syncing contacts/calendar/iphoto from the macbook pro
syncing music only from the mac pro
seems to respect the other data when you are only syncing certain things. will do some more testing, but so far so good! this will make my life a lot easier