When I read the title of the post, I think "Most Sought After" by the vintage hobby in general, not a personal grail bike. I think all of us have specific bikes that speak to us but most people either have no interest in, have never heard of them or they are out of our price range. The most sought after may not be the best bikes but, to me, are ones that most casual and hardcore vintage enthusiasts have heard of and would be easy to sell in most markets.

I would consider bikes such as Peugeot PX-10's, Schwinn Paramounts, Masi Gran Criteriums, Colnago Supers and Raleigh Internationals to be such bikes. All of these bikes seem to have an intrinsic or perceived value that allows them to sell for more than lesser known, but in some cases, better makes.