Extron is used by many AV integrators. Additional cabling and programmable remote system such as Crestron may be required to do what you want. It won't be as pretty as Krell gear though.
Component switching
I just upgraded from a Krell Showcase to a Krell HTS 7.1 pre/pro. While I am pleased with the picture and sound quality, there are only 2 component video inputs on the HTS 7.1 versus 3 on the Showcase. And I was planning to add a couple of high def components later on this year. Any suggestions for a good remote control component video switcher?