mkt33
[PuristS]
5252
Trying very hard to give an unbiased opinion
Craig,
As much as you love the VC, why does it not earn more of your wrist time? I think this is a vital question to answer.
As favorable as the transaction would be, I would not jump at the deal unless the J*D grabs your heart because in the long run I think it would be more difficult to resell as someone else has already suggested. Sell the VC and hold out for something that screams "keeper" if this is the case.
Knockout features of the VC: the finish on the Lemania movement, the flaired lugs on the case, the blued hands against the silver dial, and the "status" of having a VC on your wrist (this can be a negative for some)
I've seen the Perpetual in Onyx. It is a gorgeous watch. I don't care what anyone else believes but a perpetual calender is infinitely more useful than a 30 min chronograph in my day to day activities. The J*D perpetual has an intuitive layout unlike some other perpetuals I've seen. Overall the case shape would be the same as your GS but the Perpetual is a bit thicker and heavier. The stone dials are expensive. As an example (and this information is not from J*D but from a respected independent watchmaker who uses stone dials) a 43mm Jade dial costs wholesale $12,000 US. Do the suggested retail markup and you can see why Jaquet Droz are "expensive".
If I had to make a decision I'd pick the J*D (no surprise) for its uniqueness in design. I could always pick up an extremely well finished Lemania elsewhere if I felt like I needed one in my collection...even "move up" to a Patek 
Cheers, Mike
