Damn, now see what you did.. I got curious and had to run the numbers. What I got:
Principal Rate Monthly Total
$417,000 3.75% $3032.52 $545853.17
$410,000 3.75% $2981.61 $536690.16
$410,000 3.25% $2880.94 $518569.55
On the first loan, you already paid $12,130.08 of the total leaving $533,723.09 of remaining payments. The new loan if started at this point would mean $518569.55 of total pending payments, and $151.58 less on the monthly.
Total diff on the total paid is $15,153.54.
This does not include any PMI, service charge, bribe to the local constabulary.. etc.
