2 sources and 2 destinations

Do the 2 destinations have to be able to display different images? Like this...

PC 1 to Projector
PC 1 to Plasma
PC 2 to Projector
PC 2 to Plasma

Will you have to be able to route your signals like that? Or will both the projector and plasma always be displaying the same picture?

If they will, then all you need is an A/B type of switch. Simple 2 input, 1 output switcher then a VGA splitter, or a 2 input, dual output switcher.

If the projector and plasma will need to switch between seperate sources independently, you'll need a matrix switcher.

You probably already knew that, I'm just trying to clear things up so everybody's on the same page and is all looking for or trying to think of the same solution.