I would check out PADI .SDI ,SSI And such get a feel for hwhat they cover how the instructor teaches the class what all he will cover and to what degree . does he go above and beyond just the text or stick to the nuts and bolts of the program. I think the instructor make the bigest differace. most of the classes I know of have pritty much the same material . go with the agency /instructor that will give you the best instruction , no matter what agency it is , it does not matter if you were cet. with PADI or SSI YOU DO NOT HAVE TO STAY WITH THE SAME AGENCY, Shop around get the best for what you pay for . REMMBER THIS IS YOUR LIFE . DIVING IS NOT TO BE TAKEN LIGHTLY