Does anyone have a DVI, USB, KVM that works good ?

I bought a belkin one and the video periodically filckers and has lines. A two station one is fine I would like dual head but the only one I have seen was pointed out by Drakino and it far too expensive.

I have found other switches with DVI but I don't know if they have the same problem.

Edit:

Or if I can't find a good dvi one are there devices so I could just share the mouse and keyboard between the two computers without video.