Tom and Rich - Thank you!
I have heard back from Michael @ Chris Sawyer's and Bill Letts @ St. Thomas Diving Club for my St. Thomas stop. No responses yet from Dominica. Sara @ One-on-One and Lionel @ The Dive Shop for my Barbados stop AND Wendy @ Mermaid Divers in Aruba. So far, so good. I will email the others you guys mentioned as well.
The prices all seem to be about the same. One-on-One is higher, but it is private too. So, I am confirming the "extra amenities" ie: pick-up and drop-off service etc. and probably going to pick the shop that is prompt and thorough with their communication and has good feedback on these boards.
If anyone else has information, I would greatly appreciate it.