Belzelbub
Contributor
I agree with your descriptions and reasoning, but disagree with the order somewhat. But really no wrong answers.This is the order for major purchases that I recommend to my customers, repectively:
Mask- Has to fit your face well
BCD- Customized to your body and familiarity with weight system, etc., is paramount
Computer- Sometimes difficult to rent. You need to know how to use it and understand what it is telling you.
Wetsuit- Everyone pees in wetsuits... get a nice one that fits well and is appropriate for the majority of conditions that you dive in.
Fins and Boots- Appropriate finning technique makes you more efficient underwater. Better SAC rate. Better for reef health.
Regulator- Easy enough to rent, but you can configure yours in a way that best suits your diving. Nice to breathe out of a quality regulator
If I were to buy everything today, my order would be as follows:
Mask, Fins/boots: Usually required personal gear for a class.
Computer: While you can rent one, getting familiar with a different computer each time is not the best route.
Wetsuit: Same reasons.
Regulator: Same reasons.
BC: I put this last as these are easy enough to rent, and apart from a few examples function pretty much the same. Inflator is usually in the same position, weight systems are also generally similar, or at least close enough that renting for a while would be fine.