you might find someone with steels, but for the most part everyone uses aluminum. it is an emerging nation and the new steels are quite pricey. you can rent a computer at most dive shops, but keep in mind you will have a divemaster babysitting you on every bubble safari and will tell you when its time to go.
for advanced diving the blue hole is exactly that (i've broken the 130' rule every time i dive it). if you consider a dive advance by the depth you reach, quite a few are on fairly deep walls, 90-110'. talk to the DMs for thier favorite advanced dive and see if they are available to take you
[This message has been edited by fred (edited 12-06-2000).]