Joe:
As "locals", my wife & I regularly dive the BVI's, Saba, and throughout the eastern caribbean.Baskin is a great operation as is Dive BVI. Blue Water is relatively new. The dive sites around the US & British Vrigins are typical caribbean reefs with max depths of around 80 - 90 ft. Saba is where you go for deeper diving. Great pinicals which start around 60 ft. and go way down. Saba Deep is a quality family run outfit. Sea Saba is also good. The others are all of recent vintage, or new operators who boughtout an established shop, use caution. Saba diving is unique. You leave from the small port facility and zip around the west corner of the island to the dive sites. None more then 15 min. away. You then do one tank, and return to the harbor. Relax at the "INN TOO DEEP" (run by Saba Deep), and zip out to another dive,come back in have lunch, and do an afternoon dive. There are no real beaches on Saba, and not much else to do except dive. Nite dives are usually at ladder bay, and are quite nice. Saba is one of our favorite places. Flying in is an experience--like landing on an aircraft carrier.
In Tortola, be sure to dive the wreck of the Rohn. It's world class. Went down around 1865. Nite dives on the Rohn shouldn't be missed. Try to get to Virgin Gorda. There's a nice wreck off to the northwest. In St. Thomas, try Chris Sawyer's Dive Center.
Maybe will get a chance to meet, I dive with Chris Sawyer on weekends reqularly.
JeffW