i beg to differ.
Absolute Basics
stage 1: Mask, Snorkel, Booties (if needed), Fins
stage 2: Dive Comp, Underwater Housing for your camera (if ur into photography), wetsuit/rash guards
This is my recommendation. As for BCDs, Regulators, i will not recommend, unless ur a hard working person and pays attention to details and keep these items well, and of course, dive regularly.
Reason: simple. these items concerns the safety of ur dive. if 1 o-ring crack or burst due to long exposure to heat, or inproper care and maintained.. well, lets just say u'll be exercising everything u learned in ur OW course.
so normally, i'll jst rent BCDs from dive shops, along with regulators. Umm.. you can also buy just the mouth piece too.. if ur a hygiene guy.. those are cheap.
other equipment i bought, gloves (i got my hand cut once decending from rope to a wreck.. after that dive trip, i immediately bought gloves.. just in case), metal stick (i tend to get very excited when i see somethign.. with a stick, i whack my tank to signal friends of the interesting find)..
GREEN LASERPOINTER.. this is damn cool.. RM45 from jalan petaling.. 75mW.. damn strong laser pointer.. when used with 2 layers of condom (please pre-wash to remove the lubricants).. it works like a charm.. can point at fish or interesting finds.. easy for people to follow your laser pointer as a line forms from the pointer to ur target.. but do avoid the eyes of the marine creature.
underwater torch.. if ur into night diving. for me, i jst rent from the resort..
here's my 2 cents comments..