Repair shops like Comp USA use KVM switches which by necessity use cable extensions with no degradation.I also had a bad cable which gave me "ghosting",but I replaced it and although I have a 10 foot extender I see no problems.Be advised ,you'll also need to extend any keyboard and mouse cables(don't forget about USB mice),possibly audio speakers and microphone,backup UPS monitor connections.I had to buy a small 2nd UPS so that I could move my primary UPS with the box and keep 2nd UPS for monitor,USB hub,PDA etc..You can run a heavy power extension instead of buying a 2nd UPS.There often is more to these kind of projects than you first realize.