Cheap woul dbe nice but reliable and working much more important. the switch I am looking at is the
2-Port USB 2.0 DVI Dual View KVMP™ Switch
What connectors are on your proposed switch?
Googled his switch and found this page. It had this picture of the connections in the back:
So it looks like a bunch of dual link dvi's, usb's, and 3.5 mm audio jacks.
But to connect the mini-displayport versions of the 27" display to this would require the Atlona converter.
And as you say, NOT CHEAP.