A lender would likely approve you up to $218,081
On $68,000 of gross income with $550 of existing monthly debt, the 28/36 rule supports about $1,490 a month toward housing. With $39,000 down at 6.65%, that reaches roughly $218,081 — a $179,081 loan at 17.9% down. Your resulting debt-to-income ratio would be 36%, and you are currently limited by the total debt.