Very interesting; it sounds like it would be worth the initial investment to purchase a comprehensive system up front. By doing this, one could avoid all the challenges of software integration. If choosing to add on to an existing system, it is very important to ensure that the systems are compatible. What is most important, as in most cases, is that you take the time to figure out exactly what it is that you want. Once you have that information, search for the vendor that can best satisfy your needs.