I'm suspicious of making market predictions. I have a feeling that's like asking in 2006 how many home runs I think Barry Bonds could hit.
You ask a good question about which era I prefer. It's hard to answer, in part because I managed to get a collection together before prices went insane. If I hadn't, this era would frustrate me more than it does. I miss the phone conversations and I miss the revelations of whole books being uncovered. There was a level of urban legend that's gone. What was that store in the South (New Orleans?) that had a complete Kirby Tales of Suspence book in bags on the back wall? What mid-west convention did a Ditko ASM cover show up at? The maps weren't drawn yet; in the corners were a lot of "here be dragons" kinds of legends.
Today is the golden age of archives. Think about it: unlike 1995 I can find a good reproduction of pretty much anything, and IDW, Marvel, DC, et al are doing a pretty nice job at making good-looking reprints available of everything. That's handy.