I am buying equipment for the first time and I am not sure which items are better to buy compared to others. For BC vests I am pretty sure I would like to buy the pearl model by aqualung but I don't know what the pros and cons for the i3 would be, I have never used that system before. For regulators I am looking at the Mikron and the titan LX supreme. For dive computers I am looking at Gekko and Vyper, also I do not know whats better a 2 gauge unit or a wrist mounted one. Any input or information about personal experience with one of these products would be a great help since I am new at this. Thanks!!!