A lender would likely approve you up to $391,793
On $106,000 of gross income with $550 of existing monthly debt, the 28/36 rule supports about $2,473 a month toward housing. With $75,000 down at 6.65%, that reaches roughly $391,793 — a $316,793 loan at 19.1% down. Your resulting debt-to-income ratio would be 34%, and you are currently limited by the housing ratio.