Dream A/V System

If there's anything I want in life, it's to build this.

Basically a system through which I can direct all "media" in my home. All my pcs' video-I/Os, all my game machines, stereo equipment, linked together through a system that allows me to reroute signal to display/device as I see fit, transperantly to the devices....really, I want a full video-mixing system, when it comes down to it. Hmmm. Anyone got a spare $50k I can play with?