At 20, it is not bad at all!
I think a Vacheron 1921 would be the right addition in your collection.
But I am not you, and the watch has to please you.
Why not some other tracks?
U.N Sonata, Lange Richard Lange, JLC Duometre ( à Chronographe or Quantieme Lunaire ), Patek WT 5130 or 5110 ( but you already get one with the GP ), AP Royal Oak jumbo ( the Vintage or the new re edition Ref 15202, or the Jubilée ) are some other possibilities to consider...
Welcome here!
Best,
Nicolas
This message has been edited by amanico on 2012-01-31 07:55:16