Wow...reading the answers makes me feel old. Anyone noticed, that most of the animes you named are not really old ?
I'm 30 and i watch anime for 14 Years now, and i would say the best anime was (and will ever be) The Hakkenden.
Why ? Because it's not just some random action movie and/or comedy. To fully understand this masterpice, you have to watch, concentrate and focus.
For me, this series is the real proof, that animated movies CAN be art, and not just something to waste time with.
This my people is only my oppinion, not a new law, so please don't become aggresiv, and now, in my country it is 7pm, i'm off to my parents for celebrating Weihnachten.
Also, allen ein frohes Fest, bis die Tage !