Xbox 360/monitor awesomeness

Okay so I’d like to have my xbox 360 plugged into my monitor I’m thinking about getting one of…

These though it looks like if I want to use my PC I’d have to un-plug it from the xbox and then plug it back in to my PC arent there switches that can be used to switch between two computers on one monitor or something? And if so would one work with this?

Also where would I get my hands on one?