I just recognized your screen name and realized you are a fellow Temeculan, SANDAG only covers San Diego but Temecula’s median household income is 78K, their stats are current as of Jan 07. There is a difference between Median Family Income and Median Household Income, household is higher and I don’t remember which one Rich used for his 5x and 7x examples so my examples may need to be adjusted. But i think you get the point of what a fundamental is.

I think I like the rent vs. buy formula mentioned above even better than Hh income because it truly lets you know if something is worth buying or renting because those are the two choices when you boil it all down.