heya MB
The first universal question that you need to answer for us and for yourself is what kind of diving you plan to do most often. Ie, cave or wreck diving in 35 degree oily water every day is a lot different than paddling leisurely around Grand Cayman at 15 feet every six months. I'm being goofily extreme, but the environment you dive in will dictate the minimum level of gear you will need.
I don't want to direct you to specific models personally, because I've only had personal experience with a few, and mostly not the ideal stuff. I will second the advice to try out as much gear as you can and make subjective judgements there. You could also take the approach to do your research sight unseen and go with stuff that in general has a good reputation. ScubaBoard is a good way to get a general feel for what brands and/or types of gear divers prefer.
Around here, you're gonna find that most people give high marks to Apeks, Aqua Lung (the old US Divers Conshelf series especially), Scubapro, Zeagle, and Mares regulators; and various brands of backplate/wing BCDs (I'm no expert in this field).
A lot of people will tell you to avoid Dacor regs because of their controversial "orphaning" of their older regulator models; I'll second that because I've mostly Dacor regs myself and besides now having an expensive paperweight labeled "Enduro", I just think they're kind of gimmicky and plastickey and not all that impressive performancewise either. If really long term service is important to you, Scubapro and Aqua Lung have great reputations for supporting their products for
decades.
One old standby in the regulator world that is still popular and pretty inexpensive to buy new is the Scubapro Mk 2 Plus (first stage) / R190 (second stage) combination. This reg gets a lot of mentions as a classic, simple, go-anywhere workhorse reg that doesn't necessarily offer the highest absolute performance but will do an adequate job within recreational diving limits, and keep doing it for years. I strongly considered buying one of these myself until I instead started piecing together a US Divers rig from piecesparts on eBay.
Anyway, that's my two bits worth. Good luck!
cheers
Billy S.