Sorry to hear about the problems with the Gansevoort. I will ask my husband tonight about music restrictions at Grace Bay Club, but I know I have shot weddings there well past 11pm and music was going strong. They may have an 11pm or 12pm cutoff because they don't want to disturb guests in the late hours. We do lots of weddings there, so I don't think it's an unreasonable restriction if there is one. Otherwise, brides would not book!
I like the locations of GBC and Seven Stars, because it's a lot more convenient for guests to go to shops/restaurants/grocery stores etc without having to have taxis or rental cars. You also have Ocean Club West and Villa Del Mar by these properties if you have any guests that are looking for a lower cost option and yet they still can be close by. If you want an idea of basic room rates, check out www.turksandcaicosreservations.tc . They keep all of the hotel/villa information on island and sometimes have better rates than the hotel web site and keep up to date on all of the current deals going on.
Just a heads up as well, Next weekend the island is PACKED for the 4th of July weekend. I have talked to numerous people in the hotels this week and we are really surprised to be this busy late into the season. Just know if you don't get an immediate response, they may be running about quite a bit. But if you don't hear back within a few days, email again! Let me know if you have any other questions on the island and I'll try to help out!