Maybe not today's classics, but the trend is that pre-Trek associated anything (Gitane, Fisher, Lemond, Klein, etc) is more sought after than post-Trek anything. Many of these still found for cents on the dollar. Today's bikes as investments for tomorrow's trends would be difficult to predict. Best to take the best riders of today, and keep riding and caring for them. Most of the culling is done by car roof racks, sewer grates, thieves, etc

Some of the "production" 953 and KVA bikes seem to me as bikes that will really be special in a few years. I could see full 853 frames being sought after as well. I think that bikes that have "special" ride qualities are more sought after than the techno firsts. Steel excels in that regard.