Steve & Kris, this is a very common question regarding these communities. Your choice of community may depend on your price range. Golf course homes differ in price between the different Sun Cities. They go up in price the newer the community. In addition, I find that really active early retirement clients as in your case find much greater satisfaction living in Sun City Grand and using the ammenities offered than the others becuase they are geared toward the younger retiree. As an example, the community recently voted on allowing 45 year old retirees since their is a demand for it (still no children though). You may also want to consider the new Sun City Festival it is currently being built a little further west.
There are several fees tied to buying any Sun City property in addition to the annual rec fees so make sure you know these before deciding. In regards to searches, Sun City Grand properites are hard to search on line becuase it is actually classified as the city of Surprise. It is usually even harder to look at golf course only homes.
Remember also that Luke Airforce base is within the vicinity of these communities and planes may fly in the area a couple times a week.
I live in Surprise and work in these areas if you want me to give you a tour of the different communities please feel free to call me anytime at 623-734-5406 and we can arrange it.