I think its very difficult to predict really. Cant really see the nice ones going down in value though. Its all down to demand and supply. As the numbers available decrease, as they are, then the prices should really stay pretty constant, at least. And i would say demand is always going to stay pretty high. I mean, everyone into cars have always wanted an escort cosworth, havn't they???
At the end of the day though, we're all just guessing I suppose.