DVI kvm switch 2+ inputs 1 output

does anyone know of a good dvi kvm switch that takes 2+ inputs and outputs to single display? The dell 30" displays have only 1 input but I'd like to plug in two or more boxes and be able to switch between them.

So far the onse I was able to find online are bit pricey ($400+); though I did find some for around 300. I was curious if anyone used them and their experiences. My main concern is if there's any visible signal degradation?

*weird couldn't post in the hardware/software section

Where did you find 2 DVI dual link (DL) inputs to 1 DL DVI outputs for $400??

That's technically not a KVM.

http://www.kvm-switches-online.com/dvi-kvm-switch.html

ah! forgot I need a dual link one.. yeah dual links start at 500 ..

*edit
scratch that.. they start at $1000 lol

Still, cheaper to buy 1 of those and a $1200 30" than a single $7000 30" that supports 2 inputs.

If it can do what you say it can.. which I am not entirely sure of yet.