I just looked at my NAUI card and it says I got it in Feb of 1970. I did take a college class before that, 1962 before cert cards, and that's where I learned to dive.
I had the Airline hookah and think it's the Cadillac of them all. However I didn't like the noise from the gas engine. I now have a Hookamax with the 12V DC motor. It's sweet. If you go to the Hookamax website you'll see a picture of my unit mounted on a high grade wagon that allows me to pull all the gear to the beach in one trip.
Give up on the 100 pounds of weight. It just ain't so. I use both a wet and a dry suit and I often have about 30 pounds as I like to be a bit on the negative side so I can fan the targets easier. I can always add a touch of air in the BC to get neutral if I want.
I went with the hookah as I have to travel too far to get air. And...as somebody already said, carrying that aluminum 80 to the water is no joy. I get about 3 hours out of the electric hookah before I need to do a battery charge.
I traded the weight of the batteries, which is about 125 pounds, for the quietness of operation. In the wagon they are not a problem. I have 100' hoses, now on hose reels, and park the wagon at the edge of the water and work from there.
They now have buoyancy compensators that integrate the weight with the BC. They also have nice weight belts with shoulder webbing, like a back pack, to make carrying the weight more comfortable. You dump the weight by releasing the bottom of a pocket in which the weights are carried. You don't take off the harness itself.
Get a hookah and enjoy. Jim