An interesting comparison of purchasing power

$525,000 mortgage in 1981: $7,980 / month (18.6% rate)
$525,000 mortgage in 2000: $4,044 / month (8.52% rate)
$525,000 mortgage in July 2008: $3,318 / month (6.5% rate)
$525,000 mortgage in March 2009: $2,778 / month (4.875% rate, estimated as of this week)
$525,000 mortgage in 2010: ?