Indigo divers seem the most active dive shop online we are waiting to hear back from them to update this listing! From what we can gather they have some pretty impressive videos including tiger shark at double dip site. Don't visit Antigua for the possibility of getting shark sightings though and in general if you have been spoilt it may fail to impress you. As a place to learn to dive it is excellent however and you will enjoy the diving even if you are a novice diver.
Run out of Jolly Harbour's Crows Nest sports facility Indigo Divers is available for many in the area to come and dive the more traditional reefs in Antigua. German managed they run courses in both German and English. They pick up from Jolly Harbour so you will have to make your way there or ask if you are in a local resort like Sugar Ridge. Most dive sites are within 20 mins boat ride away from some of the western hotels near Jolly Harbour.This is a dive shop owned by PADI Professionals with many years of experience.They have a dive and sail package which would be particularly up my street. Antigua being a very concentrated sailing island I am guessing this is a natural fit.
