I lived and dove in KW for 13 years. I was a dive instructor for the college there. I am now an ICU nurse living in Lubbock Tx. I am planning a trip to my beloved, crazy little island at the end of May as well. As my plans firm up maybe I will send you a private message, but in the mean time here are a couple of my reccomendations.
I always preferred Lost Reef Adventures, 305-296-9737, Located on Margeret St, across from Half Shell Raw Bar. The Boat, "Dream", is docked right there as well. Dream is an older, but dependable boat with a platform at water level, making for an easy giant stride. You can expect competative pricing. They are rated for 16 divers, but rarely carry that many.
Captains Corner is is another favorite,305-296-8918, located at the corner of Green and Elizabeth, by the Conch Republic Seafood Company. Their Boat, The Sea Eagle, Is larger and the deck is about 5ft above the surface. Some find the giant stide a little intimadating. They tend to be about the least expensive and are some times crowded.
Seaduction Dive Shop has opened in the past couple of weeks and so I have yet to dive with them, but it is managed by Chris Norwood, who has been in the business in KW for many years and runs a safe opporation.
For any of these shops feel free to use my name (Bob Guhl), it may even get you a free trip back to the dock after you dive.
Definatly plan on doing the Vandy.
Have fun.
Safe dives
Trtldvr
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