Some financial advisers will tell you to keep your mortgage costs under 25% of your income, so that you can actually live off the money you make. I would also recommend paying at least enough into your 401k to get the company match and fully funding your Roth IRA. I'd also have an emergency fund to cover at least 6 months of expenses, including this mortgage in case you lose your job. A 15 or 20 year mortgage will give you breathing room to take care of these other priorities, and you can overpay on almost any mortgage to decrease the principleprincipal and finish in a shorter time period (make sure to get a mortgage that allows prepayment) .