It depends on a couple of things.
1) Your credit score
2) Whether or not you want to pay points.
3) Your lender
With that being said, here is what your payment could look like with a 4% rate.
Principle & interest = $730.74
Home owners insurance estimated at $65 per month
Taxes at $3,000 per year = $250 per month
USDA monthly mortgage insurance = $50.61
Total estimated monthly payment = $1,096.35