It sounds like I am a lot like you Happy- certified way back in 74 with YMCA- its been so long they no longer even have thier underwater program, as I am sure everyone here knows. after a few years of diving around LI- a lot of wrecks, open water, etc. started a business, got married, had a kid. ran out of time. my wife never even knew me as a diver. she knew I dove, but not actively diving. I have gone the conservative route as well. A buddy who is an instructor has convinced me to get back into diving. I spent all summer getting my open water certification as if I were a newbie and just finished up my advanced. As I did not have a lot of my own eq - my tanks were punched, my old equipment was not in well cared for condition.
so I purchased split fins boots and a mask. other then that I had intended to only rent for a year or so. I did discover quickly the toughest part of equipment selection is a wetsuit. if your like me - short and stout- 5'9 and 48' chest and 44" waist- its almost impossible to buy a wetsuit off the the rack- if the waist and chest ratios work the majors assume you are 6'1 to 6'5 or if the height is right- you the chest and waist is 4 inches too small. I ended up buying a custom suit from a company called wetwear down in florida- if you have never looked at thier suits, they are really great folks. about the same price as the best off the rack- made from rubbertex instead of neoprene - I dove 90' in a quarry in October with a 3mm suit- no compression to spreak of - and for old guys like me- so easy to get in and out- arm zips to elbow, leg to the thigh and back zip diagonal from hip to opposite shoulder.
Im rambling now. I love diving again.