Just a suggestion - if you ever fancied splashing out on a new monitor, there are some older high-end monitors which can be found reasonably cheap-ish which have two inputs and a switch on the front panel to choose between them.
I am using a Sony Multiscan G400 which has this feature and it works very well for switching between my Cybervision and scandoubler.
It also avoids the extra cabling beween computer/switch/monitor as well as the box itself - maybe an idea if you're tight on desk space. :-)
