Honda dealers accept 50% and full payment both. I personally gave them all the money in last week of May and surprisingly got my car 10 days later. Of course I gave them all the money including the optional things I wanted in the car like fog lights. So there is always a chance (though very very small) to get an early delivery. If you have the money, why not give it to them. Why wait for till one month before delivery. Just my thoughts.