Thanks Everyone For Your Suggestions, Comments & Tips.
With your assistance, and research/reading one has done so far, my head is nearly exploding! *LOL*
Did find out a few things: First it is best to decide what one wants to cook in a PC, then find one that suits, rather than the other way round.
For instance many older and some pressure cookers require one or more cups of water/fluid in order to reach the proper pressure. While this may be good for say corn on the cob, it can often mean certain other foods like meats may come out like "baby food", that is, mush.
Stainless steel isn't always better than aluminum, as many vintage SS units and some cheap modern ones do not have a "sandwich" core base, but are totally made of stainless. This can lead to hot spots and burning/sticking. Spoke to Presto earlier today (great telephone customer service by the way, and they are based in the USA!), and was told the early SS Presto models actually required a bit more water than their aluminum peers or modern units. This is to counter the fact they cook hotter and helps prevent scorching/burning of some foods.
OTHO, the Kuhn units, considered the TOL of pressure cookers aren't without some issues as well. While they do use less water any most other units out there (about 2 tablespoons), which is great for pressure cooking say beans, and have them emerge done, but still firm,and not like mush, the unit goes from "off" to "high" pressure. Instead of lowering the heat to create a lower pressure, one has to wait until the unit reaches it's high pressure, then "push" that temp down. Again depending upon what one cooking this may not cause any problems.
To be fair, the nice lady one spoke with at Presto stated the company has made changes in it's PCs to reflect modern tastes. Presto PCs today use less water than their older cousins, and the recipes have been changed to provide better results. Presto now recommends some foods such as rice be cooked in a bowl or some other insert.
As for jiggle weights versus spring loaded, everyone seems to have their own opinion. If you want safe "set it and forget it", PC cooking with no or little interaction, the modern quiet spring weighted models are fine. Others kind of like the noise and hissing of "first generation" cookers. For one thing it reminds them the thing is on and what it is doing.