So far, that's good. All too soon though it seems that economics gets in the way. Since you have a need for at least one common tool as the logic goes, well, your incremental cost for other related tools will probably be lower, particularly if you can share some of the costs, technology and customer base. Quite obviously, it is a short step from KM need to Enterprise Solution. I am afraid that it is a short step, and a long fall. At least that has been my experience.
"SocialMe" has done a great job of stepping outside the box of conventional technological thinking to survey the new landscape. I particularly enjoy the illustrations, along with the tag line
"There is no tool to rule them all."
Highly recommended reading!