Australia, New Zealand & the South Pacific - Best scuba in Cairns?

Going to Cairns in December. I need to take 4 open water dives for PADI certification, after which I would like to do some pleasure diving. What is the best dive operation in terms of price and service to use?

Thanks.

i have heard divers talk about poseidon and quicksilver dive operators, seem they are professional :-: ^ However, i dont know the price that they offer will be reasonable or not. Perhaps you can try this online dive company save-money-diving.com, they provide a complete range of worldwide scuba destinations: liveaboards, dive day trips, dive resorts and PADI courses at discounted rates. happy & save dive holidays.