Impossible to guess. Depends on how much income you have, how steady it is, how much debt you have, how much the car's worth, how much profit the dealer's making, how big your downpayment is, and other factors. I suggest deciding how much down payment is comfortable for you, and how big you want the payment to be (consider auto insurance, operating expense, repairs, licensing, etc.), then talk to your credit union or bank. They are money experts. Only use dealer financing if no other is available.
It is not easy to determine the amount you can get with credit score of 705 as there are other factor also which are being considered like your credit history,bad debts if any,how good you are in paying bills on time ,your salary and our price of car you are buying