Nice array of Macs.
You might look into installing Synergy on them so you can use one mouse and keyboard seamlessly across the 3 machines.
Synergy supports Screen Saver synchronize (so they all start at the same time).
And you can copy and paste text between the machines as if it was just one machine with 3 displays.
Here is one variation that uses a prefpane and a menu item extra rather than having a dock application running all the time.
http://sourceforge.net/projects/synergykm/
WAY better than using a KVM and having multiple sets of mouse and keyboards.