I have always dove using rental equipment and now want my own. Problem for me is everyone will sell whatever my credit card will bear without independant analyisis and advice on what is best. I want the best equipment the first time. I have a Scubapro MK 25 regulator and a Scubapro BC (not sure of the model). What is best? Water temps here in southern Australia are about 60f, or about 18c. I will be diving in mostly sub-tropical and tropical waters, but do not get cold, so cold water diving is also a good possibility. Any advice to move forward?