gold, page-105083

"Does anyone know good sites with reputable opinions, preferably that are investing oriented."

In 1980 the South Africa Chamber of Mines published a study about the future price of gold based upon subjective probabilities, that is, after consultation with gold experts, namely dealers, investors, miners, etc.
1
If I can recollect well the consensus (the highest probability) was that in two years time gold would be trading at around USD 800.00 or even at $2,000.00 albeit with much less probability. However, that came with the proviso that gold at $800.00 could also be seen by then to be ridiculously high. Gold 21 years later, as you must all know, was trading at $291.00.