The so called "open floor plans" are the bane of an audiophile's existence. Got to love the clanking dishes and pots banging on the stove. Erik, I believe you live in CA, the open floor plan capital of the world. Try to find a house with an upstairs "bonus room".
I do now and i love them, but I'm moving to South Carolina this year for cost saving reasons. I have to say the alternative to open floor plans is basically a packed shoe box. Really hard to let go of this.