Consider compromising on the next best thing
If it's already skyrocketing in cost, you may have missed the boat on the car of your dreams. But you can often get most of the way there for a lot less money. Say, for example, you have your heart set on a 2001-2002 BMW Z3 M Coupe, which is already a modern classic boasting an engine that's well on its way to achieving BMW-legend status. In 1999 and 2000, though, you could buy essentially the same car, but with a still very good, but lesser engine. Today, that's the difference between a $25,000 car and a $55,000 car.
Go for a newer generation of something
As a general rule, the values of classics are appraised by generations, rather than specific years. Time and again, you'll see Mustangs and Camaros priced cheaply, relative to the ones produced just a few years earlier. Assuming you aren't completely turned off by the "newer" model, don't be afraid to get on its bandwagon early.