Yes, 2 iPhones can share a comp, for you to not have the same songs and videos or pictures on the 2 phones you will have to manage the sync manualy, at the begaining in your itune on your comp, after connecting an iphone, go to the sumary tab in the itune where u will see the sumary of your phone, down you will see a list of options that can be apply on the connected phone, chose MANAGE SONGS MANUALLY and then you can check or uncheck the songs you or those that you don't want to be sync to the phone, you can also manage the videos and the pictures manualy, as for the app sync it doesn't disturb except the fact the itune will backup each one of the iPhones and you can uncheck the sync case for the apps. This is how i manage to sync my phone and my wife's phone on our comp.
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