DVI/Keyboard switch that really works at 1600x1200

[jefbak]

My Vastar 2 port DVI keyboard/mouse switch cannot handle 1600x1200 so I really need to find one that can.
Bother computers have nvidia cards but one is a 7800gt and the other is an 1100 pny.
I need to run 1600x1200 on one monitor with a switching device that will work.
Anyone had any luck with these devices at high resolution?

 

[Elfear]

This is the one I use at work and it's been good to me. It has DVI connections (not sure which you needed) and PS/2 ports. 1600x1200 is the max res.