Just returned from Turks & Caicos yesterday.
Used Provo Turtle Divers. Can't say enough good things about that operation.
Dave and Monica are the owners, and have brand new boats beautifully set up for diving. I have been diving for 20+ years, and have had experiences with a wide variety of DO's. I'm pretty much into "Gucci" diving at this point in my life and Provo Turtle Divers ranks right at the top of my list. Great boat, great service, great people, competitive pricing. Dave swears he sticks to his guns on max # of divers on his boats. The only knock I have is they don't provide lunch, just snacks.
(but then, I don't go diving for the food)
We had also heard great things about Caicos Adventures, but also picked up on some "buzz" that when things get busy the # of divers on the boat goes over their quoted maximums.
We go back at Thansgiving, we'll see if PTD repeats the performance.