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I don't think Cairns is the only choice. The Great Barrier Reef is all along the east coast of Queensland. You may consider a start from its north or south end. I did from Cairns only because it is well connected by air. It's a small town, even no beaches seems. I saw very nice photos of Whitsunday Island, which is also connected by air from major cities.
About diving, there're some info here:
http://www.queenslandholidays.com.au/things-to-see-and-do/nature-and-wildlife/great-barrier-reef-and-islands.cfm
I would recommend smaller groups.
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