Thanks for your insight so far!
I understand that the drinking window for a Clos du Marquis will be different from a Lafite Rothchild, and I think the WS suggestion reflects it. What I was trying to gauge from others are your personal experience with WS drinking windows. Futronic felt that Suckling's drinking windows were a little early for him for the Italian wines. I started drinking my 1997 Brunellos in 2004 which was the beginning of the WS window. Could I have waited a few more years for the wine to develop further? I believe the answer is yes. In retrospect, reviewing the tasting notes from others through Cellar Tracker or WS would have helped me understand where the wine is in its development.
Unfortunately, I don't have any First Growths or Grange or Massetos. The average price of my bottles are typically between $50 and $100.