It might be obvious by now, but the following charts show which DLP components, integrated with which existing infrastructure, you need based on your priorities. I have broken this out into three different images to make them more readable. Why images? Because I have to dump all this into a white paper later, and building them in a spreadsheet and taking screenshots is a lot easier than mucking with HTML-formatted charts
Between this and our priorities post and chart you should have an excellent idea of where to start, and how to organize, your DLP deployment.