This will work fine -- although it does have a built-in 2-port switch, it also works as a simple extender for the keyboard, video, and mouse signals:
http://sewelldirect.com/KVMcat5extender.aspOn the other hand, if you want to simply use extender cables, these will work IF you're using a PS/2 keyboard and mouse (USB cables can' be extended that far):
Monitor:
http://www.monoprice.com/products/product.asp?c_id=102&cp_id=10201&cs_id=1020103&p_id=3619&seq=1&format=2Keyboard & Mouse (You need two of these):
http://www.monoprice.com/products/product.asp?c_id=102&cp_id=10204&cs_id=1020401&p_id=2540&seq=1&format=2The Cat-5 extender is a much "cleaner" solution, since you only need to string one simple Cat-5 cable.