Scenario 0: 500k house, 30yr/3% interest rate, 100k down (20% standard) = 400k total loan amount and 1,686 monthly payment
Scenario 1: 400k house, 30yr/7% interest rate, 100k down (let's say you still have that cash and put it all towards down payment) = 300k total loan amount and 1,996 monthly payment.
This is assuming in your housing market prices have cooled by 20%, I'm not seeing drops like that in my market. Your monthly payment just increased $300.