Maybe you could use the monitor itself. If you can use multiple inputs into the monitor, and just use the control on the front of the monitor to switch which input is displayed. This might be the simplest solution, but pushing buttons on the monitor isn't great to change quickly.
I haven't used a KVM switch since they were all VGA and PS2 connections.
Sorry it took so long to respond. Just got around to trying your suggestion, and it works! Once you get used to the button sequence it's not that bad changing back and forth either.
and it falls under the KISS (keep it simple silly) method which is also the most cost effective, IOW, free.
An update to this thread.
The Asus monitors have a single switch that swaps between VGA and DVI, so there is no monitor config menu to scroll through
also the monitor will automatically switch between the two if one of the computers shuts off the monitor or goes to sleep.