Not enough info to really say the “right” number. And its not clear if you are living in the house and/or some of the other items. But a $600k loan is going to be about $2900 a month. You don’t say where you are tax wise but tackle on another 1200-1500 a month for that. you obviously can afford a $4500 a month payment.

Means you need $900k or so down payment to get into the ballpark.