twojo21 - We paid by Amex. We wanted to earn the miles ont he card. You can by check, visa, mastercard, etc...
If you pay by Amex, you dont have to send a copy of the front and back of the card... others you so.
Hope that helps. I believe you can pay it off when you want and have the final estimate. We waited to last minute b/c we were still changing things. Dont forgot about your deposit. I totally forgot about ours. They will subtract anything you added at last minute from that (if u change something), and then they will send you a check.... either way you get that money back.
Jamie