Backplate - Most backplates are pretty similar, so I wouldn't lose too much sleep over finding one. I personally am using a variety of Light Monkey backplates, depending on application (OW single tank, CCR, doubles). Be wary of burrs in some AL plates, they will rip through webbing.
Harness / Webbing - I'm slowly replacing all of my webbing with Halcyon branded webbing. It's strictly a case of form and function - whenever I need to replace webbing, I can simply count the H's on each shoulder strap and note where the various points are for d-rings (d-rings, top of fourth H), etc. It's so much quicker than pulling out cloth tape measures, I can re-web a harness and have it pretty much fit right out of the gate in ~5-10 minutes with the Halcyon webbing. Plus, I believe MSRP on the halcyon webbing is about what you can expect to pay for any other harness kit so it doesn't cost anymore than a $1 upcharge to have a more efficient system.
D-Rings - five. Two on the crotch strap (one up front for scooter, one in back for accessories), one on the left waist, one on each shoulder. You don't need any more than that, trust me, I've done dives with ~5+ stage bottles using this rig. And PLEASE bend those shoulder d-rings.
Wings - I'm pretty picky here and I do not believe "cheaper is better" here. A few years back I had a cave student that went out and bought a wing that was on closeout -- in his mind, cheaper was better (he was a college student). Turned out there was a reason the manufacturer quit selling the wing -- poorly designed shape with a lot of air at the top of the cell, which pretty much guaranteed he'd be out of trim most of the time. Over the past few years I've slowly moved to the Halcyon Evolve wings, I also *love* the old Dive Rite Classic "Retro Wing" Horseshoe. The Halcyon's are expensive, I recently bought a new custom colored 60# wing and paid significantly more for it than I would have paid at full retail for the DR wing, but it is really worth it. The X-Deep wings look pretty good too, but I haven't dove one yet.
A key thing in wings is matching the wings for the cylinders. A 40# wing will NOT work well with a set of double 104s/108s, and a 60# wing will not work well for a set of AL80s. I have different clothes depending on the weather outside, sometimes I need a sweater and jeans, sometimes I need a pair of shorts and a t-shirt. Treat the wing the same way -- match it for the dive you're doing and the gear you're rocking.
Tech divers typically have a ~5 year life-cycle. Alex is pretty sharp in that if you keep your ear to the ground, you can sometimes find good deals used. Facebook marketplace seems to be a good place.
Harness / Webbing - I'm slowly replacing all of my webbing with Halcyon branded webbing. It's strictly a case of form and function - whenever I need to replace webbing, I can simply count the H's on each shoulder strap and note where the various points are for d-rings (d-rings, top of fourth H), etc. It's so much quicker than pulling out cloth tape measures, I can re-web a harness and have it pretty much fit right out of the gate in ~5-10 minutes with the Halcyon webbing. Plus, I believe MSRP on the halcyon webbing is about what you can expect to pay for any other harness kit so it doesn't cost anymore than a $1 upcharge to have a more efficient system.
D-Rings - five. Two on the crotch strap (one up front for scooter, one in back for accessories), one on the left waist, one on each shoulder. You don't need any more than that, trust me, I've done dives with ~5+ stage bottles using this rig. And PLEASE bend those shoulder d-rings.
Wings - I'm pretty picky here and I do not believe "cheaper is better" here. A few years back I had a cave student that went out and bought a wing that was on closeout -- in his mind, cheaper was better (he was a college student). Turned out there was a reason the manufacturer quit selling the wing -- poorly designed shape with a lot of air at the top of the cell, which pretty much guaranteed he'd be out of trim most of the time. Over the past few years I've slowly moved to the Halcyon Evolve wings, I also *love* the old Dive Rite Classic "Retro Wing" Horseshoe. The Halcyon's are expensive, I recently bought a new custom colored 60# wing and paid significantly more for it than I would have paid at full retail for the DR wing, but it is really worth it. The X-Deep wings look pretty good too, but I haven't dove one yet.
A key thing in wings is matching the wings for the cylinders. A 40# wing will NOT work well with a set of double 104s/108s, and a 60# wing will not work well for a set of AL80s. I have different clothes depending on the weather outside, sometimes I need a sweater and jeans, sometimes I need a pair of shorts and a t-shirt. Treat the wing the same way -- match it for the dive you're doing and the gear you're rocking.
Tech divers typically have a ~5 year life-cycle. Alex is pretty sharp in that if you keep your ear to the ground, you can sometimes find good deals used. Facebook marketplace seems to be a good place.