The difference between booking with the DC discount is that it is considered a "package" and the conditions are more strcit. I beleive it has to be paid in full prior to arrival and the cancle policies are more strict.
Breana,
I just double checked for you on my calculator and 1492.00 is correct for AS. I think that CBR at 99.00 a night is worth it, but $74 is not worth it for AS (IMO). I love the AS, when I can get it for about $50 plus tax.
I think for that many nights you will be more comfortable at CBR. I would recommend Martinique, Trinidad North , or Jamaica for locaions.