Start in St. Thomas and avoid the cost and time to take the ferry to the BVI. I've used CYOA in Frenchtown Marina twice and been very pleased with the quality of the operation, boats and service. They won't be a budget charter company since most of their catamarans are new and all have water makers, ice makers, etc. Once you factor in not having to take the ferry, they are likely comparable to any of the quality companies in the BVI.