don't rule out a well maintained newer high end kawai, they have learned a thing or two over the years and with their volume the economies of scale gives you more piano per dollar than almost any other make. (i.e look at somethign in the RX line)
if you can find one, a used kemble grand will get you a good mix of high end japanese /yamaha quality and craftmanship with a mellower richer/european sound
on the american side, it would be good if you can play a comparable mason and hamlin or even (much more rare though) charles walter.