This might sound like a stupid question or that I am being confrontational, but here it goes. What advantage would a stainless steel plate have over an aluminum plate? Yes I know that I will need to add less weight with a stainless steel plate but aren't we simply trading weight in the form of lead for weight in the form of stainless steel? I don't see any value added between a 6 lb stainless steel plate and 8 lbs of lead over a 2lb aluminum plate and 12 lbs of lead (hypothetically).
I plan on picking up a Hog aluminum plate and harness today that I am getting a VERY good deal on ($80 Canadian or about $60 US)
This is the approach I took. I have always used a jacket style BCD and just recently bought a HOG Aluminum backplate and a Dive Rite harness and wing. The plate weighs almost 2 lbs. The buckles for the waist belt plus the two on the cam straps seem like a few lbs too. This plus the fact that a back plate and wing are not as positive as a BCD, leads me to hope that my additional lead needs will be minimal to non-existent with an AL80, which is what I dive 99% of the time.
Just last week I was diving in salt water wearing a 3 mm and I took 8lbs. I knew 8 would be heavy but the conditions were really rough and since my neoprene was very dry, I wanted to get down fast. I was very heavy for the dive. (with a 3mm full suit plus a 3mm hooded vest in my jacket BCD I usually use 6lbs or sometimes 4lbs in salt water)
I did not get the opportunity to change the weight for dive #2 since the conditions were so rough. Unfortunately, that was the last and only dive of the week, so I did not get the opportunity to get dialed in. Without a doubt my new set up is more compact in a suitcase than my jacket BCD.