I am so excited for you. You got a great deal!
I hate to repeat what others have said but do pay attention to the dates on your payment plan. We just got an LCD tv on that type of finance plan. We got our first statement on 8/30 but it was dated 8/20 (it does NOT take 10 days in the mail) and the payment is due on 9/9. Your best bet is to pay online because they will do everything possible to try and get that finance charge money from you.