You're welcome Ashley,

If you are a Costco member, be sure and check out their packages to the Cooks. They are pretty reasonably priced and a 7-night stay at the Rarotongan Resort (a decent if unspectacular place) can cost you less than the cost of the airfare alone (directly from the airline). I would avoid the Edgewater Resort however, as it seems to get rather negative reviews.
The only problem with Costco is that the do not offer stays at very many different resorts, otherwise they're a good deal.

Also, remember that the seasons are reversed down there and that their winter is in July/August (when I've heard it can sometimes be a bit cool).

Ken