TRENDnet 4-Port DVI USB Type A KVM Switch with Audio - TK-422DVK
A lot of smart decisions went into designing this KVM switch and it all comes together to make a really effective and easy-to-use switch. This model works for up to four different systems that you want to connect with each one clearly marked on the front buttons and back connections areas. This model has USB ports for the mouse/keyboard and DVI video ports for the monitors. If you need VGA this isn't a great choice, which is perhaps its only real weakness. However, it has microphone and speaker plugs for all four systems, and two additional USB ports for connecting storage devices or printers. The switch buttons are easy to see and press, though you can also use hotkeys to switch between systems. LED lighting clearly indicates which system is currently active and this kit even includes all the necessary cables, making it easy to set up with minimal effort.