Default Upgrading to Kitkat

I'm a samsung noob. Been an HTC guy for a few years and moved over here last month. At this point I just rooted the stock rom so I could keep my Knox flag untripped. I want to upgrade to kitkat but I am unsure of my options. Things are a bit different on Samsungs than I'm used to. Is it possible to upgrade to one of the kitkat releases and not trip Knox?