My favourite Piano VST http://www.truepianos.com (Professionals would probably disagree as Ivory http://www.synthogy.com/products.html is the standard Piano used in virtually all studio and film production)
Also take a look at the fully modelled piano (No samples at all) being developed by http://www.pianoteq.com/index and for a fully modelled Guitar (As well as others) http://www.sonic-core.net/en/products/soniccore.html (And yes, the scope sound engine and DSP card is the one used in Wersi OAS 7)
As I have said before, 10 years from now all sounds will be modelled, with samples (Of any size) being consigned to the history books.
In fact 10 years from now, people will asking how on earth we ever considered today’s sounds to sound anything like the real instruments.
Roll on the future

Bill