I've had this problem too. The best switch I've found was a Protec out of Canada and the last time I used it I bought the best cables Belkin had to offer (that time I verified that the ghosting problem was made worse by the belkin cables).

Actually, under normal use, I probably wouldn't have noticed, but I do cad work, with tiny black lines on a white background, and it's very apparant there.

I, too, would love to find something that works.