Everyone gets up in arms when it comes to making assumptions. I'm not sure why you are asking so I will answer a slightly different question if it would help with anything.
How much would I, personally, need to make to feel comfortable with the following homes-
Assuming a 20% down payment and reasonable taxes (2%) I would want to make-
$150,000 for a $350k house $185,000 for a $500k house $200,000 for a $650k house $225,000 for a $800k house
Is this anything along the lines of what you are asking?