Welcome!
Have you considered the Cabo Surf Hotel? If so, let me know because I got married there and LOOOOOOOOVED it. It has a similar feel to the others you listed because it's small and private. Cabo Surf Hotel, beach resort, boutique hotel in Los Cabos with surfing, Baja diving and Cabo golf. -- they have a good amount of wedding info on their website
I honeymooned at Casa del Mar and it's a gorgeous property. They've been going through construction that has caused a bit of grief for two brides on this board, but I doubt that would be a problem next October.
Casa Natalia is different because it's not on the beach. Do you want a beach wedding? Or would you just have the reception at Casa Natalia?
We also have a few private villa brides. I thought about going that route for awhile but changed my mind as the prices seemed to keep going up and up in my budget (since you basically have to hire everyone, unlike a hotel where they have tables, linens, staff, etc.)
For any of the locations you listed, just do a Search on this forum and there is tons more info! Let me know if I can help anymore.