Is there a chart here that Rich or someone else has made comparing affordability now to historical affordability.
Rich did it here. The links are from the top of the welcome page.
Bubblebuster has their regular update which includes payment charts here.
What you see is the bubble payment to income ratio rivals the late 70s when inflation was double digit. You also see that payment to income is above 50% where as in the 87-91 bubble it peaked just above 40%.