Opinions vary and so do 80's, meaning that result do vary with in a range. That is why you read different things from one post to another. The bottom line is, what I posted yesterday; don't rush this, do a lot of research, test drive other peoples rigs if possible. In four years, I have had 4 different sets of springs on my rig as offerings have evolved and my quest for something "better" continued.
There is no such thing as absolute or cut and dry with regards to this subject and the fact that you made the above statement shows that you have not done anywhere near enough research and info gathering on your own, rather you simply want someone to give you the answer which exist's only in your head.