I think it is dangerous thinking to say "you can always refinance later, once your credit score improves". This line of thinking got a lot of people in trouble recently.
On a $200K loan, the 0.5% difference between the 7/1 ARM and the 30 year fixed comes out to about $65 a month. If you are itemizing your taxes and you are in the 25% marginal tax bracket, the after tax cost of that interest is $49 a month.
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