Susan,
Congrats! I visited the Fairmont in Wailea and met with the WC and she was fantastic. She was kind, helpful and full of suggestions (which I needed). Although I decided on the Marriott Wailea, the ceremony site and reception sites at the Fairmont were beautiful. The ceremony site was near the water which I loved.
I only wandered around the Grand Wailea, and didn't meet with their WC or see the wedding sites, but everything there is amazing.
My only advice is to research the locations on the grounds they offer to determine if they would accommodate your group. I only have 25 people attending, and the spot I loved at the Fairmont for my reception (that was closest to the ocean) was meant for a larger group (and had a higher $$$ food/beverage minimum than I was willing to pay with such a small group). I realized very quickly that each resort has a number of options for ceremony sites and reception sites, but the sites are meant to accommodate different sized groups.
Hope that helps! I LOVE this forum and couldn't plan my Maui wedding w/o it!!