Sorry for the delay.
Halcyon's stuff is way over priced and it's not that much better. You're just paying for the name.
It's not the back-plate, it's the style of the wing that determine if you need a STA or not. Sub Gravity wings do not require a STA. I would look at the whole Sub Gravity BP/W system. You get the choice of 2 aluminum (3 stainless steel) back-plates, 4 wing sizes, 3 weight pocket sizes and 2 harness styles. They make good quality gear and are extremely helpful and quick answering email questions.
I have their 3mm aluminum BP, 26 lb wing, drop down small weight pockets and adjustable harness for my travel set up. I love their adjustable harness, clean & simple with no plastic parts.
We understand what the active diver needs from a single tank rig. Simple, streamlined, balanced, and easy to travel. We built the Paragon single tank package to offer a modular and customizable BCD to best suit single tank diving needs. At the heart of the Paragon Single Tank Package is the...
sub-gravity.com