This chart shows the average interest rate on a 30 year fixed mortgage for each year of the past 20. As you can see there has never been a better time to get a loan! If you think that interest rates don't make that much of a difference.
Here is a great example of how much impact they have:
If you purchase a $250,000 your payment for principal and interest
at 6% = $1498.88 and at 4.5% $1266.71.
That is $232.17 per month and $83,581 over the life of the loan!!!!